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CLIL: teaching subjects through English

Content and Language Integrated Learning means teaching science, maths, art or geography in English, so children learn the subject and the language at the same time. Done well it gives English a real purpose. Done badly, children learn neither. Here is how to plan for the first.

For bilingual, international and EFL primary teachersChecked 7 November 2026Sources: Cambridge English, British Council

CLIL in 60 seconds

What: A subject is taught through an additional language, with planned aims for both the content and the language.
Key framework: Do Coyle's 4Cs: content, communication, cognition, culture.
Who teaches it: Subject teachers working in English, or English teachers borrowing subject topics. Both need to plan language deliberately.
Biggest risk: The subject gets simplified until children are not really learning it. Scaffold the language; do not water down the thinking.

What CLIL is, and is not

In a CLIL lesson the content decides what is taught. If the science topic is plants, children need words like root, stem and absorb, and structures like "If plants don't get water, they...". Those are taught because the science needs them, not because they are next in a grammar syllabus.

CLIL is not simply "teaching in English". A maths lesson delivered in English with no thought for the language is just a hard maths lesson. The difference is that a CLIL teacher plans the language children will need and builds supports for it.

The 4Cs framework

C	Question to ask when planning	Example: floating and sinking
Content	What subject knowledge or skill will they learn?	Some objects float and some sink; we can predict and test.
Communication	What language do they need to learn it and show it?	float, sink, heavy, light; "I think it will...", "It floated because..."
Cognition	What thinking will they do?	Predict, test, compare, explain.
Culture	How does it connect to them and to others?	Boats in our country and others; working as a team of scientists.

Language of, for and through learning

Coyle's "language triptych" is the most useful planning tool in CLIL. It splits the communication C into three:

Language of learning: the subject words and structures (float, sink, material).
Language for learning: what children need to do the activity (I think..., Let's try..., What do you predict?).
Language through learning: new language that comes up during the lesson and you catch on the board (It's bobbing!).

Researchers also distinguish everyday conversational English from the academic English of school subjects (Cummins called these BICS and CALP). A child can chat fluently in the playground and still struggle with "Compare the two results". CLIL lessons need to teach the second kind explicitly.

Scaffolds that work

Visuals and real objects for every key word.
Word walls grouped by function: naming, describing, explaining.
Sentence frames for each thinking step: "I predict... because...".
Graphic organisers: tables, Venn diagrams, flow charts that carry the content with fewer words.
Demonstrate first: do it, then say it, then write it.
Pre-teach five or six key words, no more, before the main activity.
Allow the home language for thinking in groups when the content is hard, then report in English.

How strong is the evidence?

Honest summary: research on CLIL, mostly from Europe, often finds gains in English, especially receptive skills and vocabulary, with subject learning usually not harmed. But many studies compare CLIL classes with pupils who were selected or chose to join, which makes CLIL look better than it may be. British Council research on primary CLIL in France and in multilingual classrooms notes that evidence on everyday classroom practice is still limited, and that teacher knowledge is the key factor. Expect benefits when lessons are planned for language, not automatically.

Try it tomorrow: "Will it float?" (45 minutes)

Level: A1 to A2, ages 7 to 11. You need: a bowl of water and eight objects (coin, cork, leaf, stone, plastic lid, paper clip, pencil, sponge), a two-column table on the board.

Minutes	Stage	What happens
0 to 8	Key words	Show each object and name it. Drop one in: "It floats." Drop another: "It sinks." Class repeats and does a hand action for each (flat hand for float, hand diving for sink).
8 to 15	Predict	Board frame: "I think the ___ will float / sink." Pairs predict for all eight objects and tick their table.
15 to 28	Test	Volunteers test each object. Class says the result together. Pairs mark right or wrong next to their prediction.
28 to 38	Explain	Introduce "heavy / light" and "made of wood / metal / plastic". Frame: "The ___ sank because it is ___." Pairs say two explanations, then write one.
38 to 45	Share and catch	Three pairs share. Write any new useful language that came up on the board (language through learning), and keep it for next lesson.

CLIL planning checklist

Tick these off before any CLIL lesson. Print the page to use on paper.

I can state the content aim in one sentence. I have listed the language of learning (6 key words at most). I have written sentence frames for the language for learning. Every key word has a picture, object or action. There is at least one thinking task above remembering (compare, predict, explain). There is a graphic organiser so content does not depend on long reading. Children speak in pairs before anyone speaks to the class. I know how I will check both the content and the language at the end.

Frequently asked questions

What does CLIL stand for?

Content and Language Integrated Learning: teaching a subject through an additional language with aims for both.

What are the 4Cs of CLIL?

Content, communication, cognition and culture, a planning framework developed by Do Coyle.

Do CLIL teachers need to be English specialists?

No, but they need a good level of English and to plan the language of their subject deliberately. Cambridge's TKT: CLIL covers this.

Does CLIL harm subject learning?

Studies usually find subject learning is not harmed when language is well scaffolded, but many studies have selection bias, so plan carefully and check understanding often.

Which subjects work best for primary CLIL?

Hands-on subjects with strong visuals: science, art, PE, geography and simple maths are common starting points.

Topic-based English, already planned

Our free programmes are built around topics like animals, weather and the world around us, easy to link to science and geography. Litlings adds class tracking, free for up to 40 pupils.

Try Litlings free

Sources and further reading

TKT: CLIL glossary (Cambridge English, PDF)
The knowledge base of CLIL teaching in multilingual primary education settings (British Council)
The current landscape of CLIL in primary education in France (British Council)
Coyle, D., Hood, P. and Marsh, D. CLIL: Content and Language Integrated Learning (Cambridge University Press, 2010).