Language acquisition and language learning, and how language develops

What this heading covers

The largest single block of questions in the language papers comes from here — roughly one in six of Language I and Language II — and almost none of them ask for a definition on its own. They describe a learner or a classroom and ask what is happening, which means you need the terms and the position the syllabus takes.

That position, stated once so the rest follows: language is acquired through use, not assembled from rules. Teaching that gives learners something to do with language beats teaching that gives them facts about it.

The principles of language teaching have a lesson of their own, because the syllabus gives them a heading of their own. What belongs here is how language is got in the first place.

Acquisition and learning

The distinction is Krashen's, and it is the single most examined idea in this heading.

	Acquisition	Learning
How it happens	Subconsciously, by using language for real purposes	Consciously, by studying the language
What the learner attends to	Meaning	Form and rules
Typical setting	Home, playground, immersion	Classroom, grammar lesson
What results	Fluency; knowing what "sounds right"	Knowledge about the language; ability to explain a rule
First language	Acquired	—

A child acquires their mother tongue without a single grammar lesson, and by five has mastered a system no adult can fully state. That fact is the argument for the whole communicative position.

Krashen's five hypotheses

The paper draws on all five, and names them.

1. Acquisition–learning. The two are separate systems, and what is learned does not simply turn into what is acquired.
2. The monitor. Consciously learned rules act mainly as an editor, checking output when there is time — which is why a learner who has memorised rules may still not speak fluently. Over-use of the monitor produces halting speech.
3. The natural order. Grammatical features are acquired in a fairly fixed order, and that order does not follow the syllabus. Teaching a rule earlier does not mean it is acquired earlier.
4. The input hypothesis (i + 1). Learners progress when they understand input a little beyond their current level — comprehensible, but slightly stretching.
5. The affective filter. Anxiety, low confidence and fear of ridicule act as a filter that blocks input from being absorbed. A frightened learner cannot acquire, however good the teaching. This is why a question about a child mocked for their accent has an answer about the classroom climate.

Treat these as the framework the syllabus teaches rather than as settled science; they are debated among researchers, but they are what the questions are written from.

i + 1 and the zone of proximal development are not the same

The paper puts these side by side to see whether you can separate them, because both say "slightly beyond the current level".

• i + 1 (Krashen) is about input — what the learner hears or reads. No helper is required; comprehensible language reaching them is enough.
• ZPD (Vygotsky) is about assistance — what the learner can do with help that they cannot do alone. A more capable person is part of the definition.

One is about exposure, the other about interaction.

How language is acquired: the four explanations

Theory	Core claim	The difficulty with it
Behaviourist — Skinner	Imitation, reinforcement, habit formation	Children produce sentences never spoken to them
Innatist — Chomsky	An inborn language faculty and a universal grammar	Gives little weight to interaction and environment
Cognitive — Piaget	Thought develops first; language expresses it	Language also shapes thought, which this misses
Social interactionist — Vygotsky, Bruner	Language grows out of interaction with others	—

Skinner — the child says something, is understood and rewarded, and the behaviour strengthens.

Chomsky — imitation cannot explain it. He proposed an innate language acquisition device (LAD), a biological readiness for grammar, and a universal grammar underlying all languages. His argument from the poverty of the stimulus is that children produce far more than the language they hear could account for.

The decisive evidence, and a favourite question: overgeneralisation. A child who said went correctly begins saying goed; foots, mouses, teached appear. Nobody taught these. They prove the child has extracted a rule and is over-applying it. The error is evidence of progress.

Vygotsky and Bruner — the social answer. Vygotsky adds that language is not only for expressing thought but is the tool of thought: the child talks aloud while working (private speech), and that speech later goes inward and becomes thinking. The evidence that settles this against Piaget's reading of the same behaviour is that private speech increases when a task gets harder. Bruner names scaffolding — support given heavily at first and withdrawn as the learner takes over — and sets a language acquisition support system (LASS), the family and community, beside Chomsky's LAD.

A reliable one-mark trap: LAD is Chomsky's and internal; LASS is Bruner's and external.

The stages of language development

The upper primary syllabus names language development as a heading of its own, and the order is asked more often than the ages.

Stage	Approximate age	What appears
Cooing	0–6 months	Vowel-like sounds; comfort noises
Babbling	6–12 months	Repeated consonant–vowel strings, ba-ba, da-da
One-word (holophrastic)	12–18 months	One word carrying a whole meaning — milk for "give me milk"
Two-word / telegraphic	18–24 months	Content words only, no inflections — mummy go, more juice
Multi-word	2–5 years	Sentences lengthen, grammar enters, questions and negatives develop
Overgeneralisation	throughout	Rules over-applied — goed, foots — evidence the rule has been formed

The ages are approximate and vary from child to child; the sequence does not.

Two points the paper uses:

• Comprehension runs ahead of production. A child at the one-word stage understands bring me your shoes and cannot say it. So a quiet child is not necessarily a child who understands less.
• The vocabulary spurt. Between about eighteen months and two years, word learning accelerates sharply, usually explained by the child grasping that everything has a name.

The critical period

The critical period hypothesis holds that there is an optimal window for acquiring language, roughly up to puberty, after which the same ease is not available. It is the reason early exposure matters, and the reason delaying language work in the early classes is treated as costly.

Many now prefer sensitive period, since language can still be learned later — only not as effortlessly.

First language and second language

	First language (L1)	Second language (L2)
How it arrives	Acquired	Largely learned
When	Early childhood, without instruction	Later, with effort
Outcome	Everyone succeeds	Success varies widely
Needs a foundation?	No	Yes — rests on L1

The last row is the examinable one. A strong first language makes the second easier, because concepts built once need only a new label rather than rebuilding. That is why replacing the home language rather than building on it works against the learner, and why the syllabus treats the home language as a bridge to the school language.

Three terms the paper separates: mother tongue is the language of the home; regional language is the language of the area, which may not be the mother tongue; medium of instruction is the language of teaching. A learner for whom all three coincide has the easiest start.

BICS and CALP

Cummins's distinction, and the one that explains the upper primary stage.

	BICS	CALP
What it is	Everyday conversational language	The language of subjects, reading and writing
Support from context	High — gesture, situation, tone	Low — the text alone
Time to develop	Shorter	Considerably longer
Example	"Let's go and play"	"Rainfall results from a fall in pressure"

A child who chats fluently is assumed to have "got" the language; but that is BICS, and the textbook is written in CALP. This gap is a leading cause of learners stalling at the upper primary stage, and it is what a question describing a fluent speaker who cannot follow the science book is testing.

Learning the language at the upper primary stage

A named heading for both the first language and English, and the shift it describes is real.

By classes VI to VIII the basic system is in place; the learner can read and write. The work is no longer building language but turning language into an instrument for learning.

• Reading changes purpose — from learning to read to reading to learn.
• Each subject has its own language, with its own vocabulary and sentence patterns, so every teacher is a language teacher.
• Abstract language arrives — conditions, hypotheses, cause and effect, comparison.
• Extended writing — paragraphs, arguments, reasons for an opinion.
• Critical reading — purpose, bias, what has been left out.
• Peer language matters more than the teacher's, and feelings about one's own language — pride or shame — sharpen at this age.

What does not change: language still arrives through use. CALP is built by the volume of reading and writing, not by more grammar exercises, and the affective filter is at its highest here because the fear of looking foolish in front of peers is at its strongest.

The vocabulary the paper assumes

These turn up as one-line questions, and the definitions must be exact.

Term	Meaning
Phoneme	The smallest unit of sound that can change meaning. /p/ and /b/ in pin and bin
Morpheme	The smallest meaningful unit. Unhappiness has three: un-, happy, -ness
Grapheme	The smallest unit of writing — a letter or letter-group representing a phoneme
Syntax	How words combine into sentences
Semantics	Meaning
Pragmatics	How language is used in context — politeness, implication, what is meant beyond what is said
Phonology	The sound system of a language
Lexicon	The vocabulary store

The pair most often confused is phoneme and morpheme. Phoneme = sound. Morpheme = meaning. A morpheme can be a single phoneme — the -s of cats — which is what makes the confusion easy.

Two more distinctions sometimes asked: a free morpheme can stand alone (happy) while a bound morpheme cannot (un-, -ness); and morphology is word formation while syntax is sentence formation.

Errors, mistakes and interlanguage

This cluster is heavily examined and rewards precision.

• An error is systematic. It comes from an incomplete grasp of the system, the learner cannot correct it when asked, and it recurs. It tells you what the learner's current rule is.
• A mistake is a slip in performance — tiredness, haste, distraction. The learner can correct it themselves when it is pointed out.

The distinction is Corder's, and it decides the teacher's response: a mistake needs no teaching, an error does.

• Interlanguage (Selinker) is the learner's own developing system — not broken target language, but a coherent grammar of its own that moves gradually towards the target. It explains why learners at similar stages make similar errors regardless of background.
• Fossilisation is when an interlanguage feature stops moving and becomes permanent despite exposure and correction.
• Contrastive analysis compares the learner's first language with the target to predict where difficulty will arise — for example, a speaker whose first language lacks articles omitting a and the. It deals with the sound system, grammar, vocabulary and writing system; it does not deal with the learner's intelligence or motivation, which is the usual trick in a "which is not part of contrastive analysis" question.
• Error analysis came after it, and looks at what learners actually produce rather than at what the two languages predict — because many errors turn out to be developmental, made by learners of every background, rather than caused by the first language.
• Interference (or negative transfer) is the first language pushing into the second; positive transfer is when a feature shared by both helps.

A question of the kind the paper sets

A class VI learner writes: "Yesterday I go to my village and meet my cousins." When the teacher points at the sentence, the learner cannot see what is wrong. This is best described as:

Two things decide it. The pattern is systematic — the past tense is missing on both verbs, not on one — and the learner cannot self-correct when the attention is drawn. That combination is an error, not a mistake, and it reveals the learner's current interlanguage rule: that the time word yesterday already marks the past, so the verb need not.

The teacher's response follows from the diagnosis. A mistake needs only a nudge. An error needs input and use that make the rule untenable — not a red mark, and not a drill on the whole class who may not share it.

Mistakes that cost marks here

• Swapping phoneme and morpheme. Sound against meaning.
• Treating error and mistake as synonyms; the whole teaching response turns on which it is.
• Attributing the language acquisition device to Skinner, or imitation-and-reinforcement to Chomsky.
• Confusing LAD (Chomsky, internal) with LASS (Bruner, external).
• Merging i + 1 with the zone of proximal development. One is input, the other assistance.
• Calling Piaget a social interactionist. For him thought comes first and language expresses it.
• Reading private speech as Piaget did — it does not disappear, it goes inward.
• Reading interlanguage as "bad English" rather than as a system in its own right.
• Treating overgeneralisation as a failure rather than as proof a rule has been formed.
• Reversing the developmental sequence, or placing telegraphic speech before the one-word stage.
• Taking fluent conversation (BICS) as evidence of academic language (CALP).
• Including motivation or intelligence in contrastive analysis. It compares languages, not learners.

In one line

A language is acquired by using it for something that matters; the sequence from cooing to multi-word speech is fixed even though the ages are not; a strong first language makes the second easier rather than harder; and at the upper primary stage the work is no longer getting language but using it to learn everything else.

In the classroom

The practical test of a language lesson is how many minutes the learners spent producing language and how many the teacher spent describing it. Almost every improvement this heading asks for — pair work, tasks with a real outcome, tolerance of error in speech, use of the home language as a bridge — is a way of shifting that ratio.

At the upper primary stage add one thing: something to read that is not the textbook. CALP is built by volume, and the twenty books in a classroom corner do more for it than another worksheet on tenses.