“But They Sound Fluent!” — Why Your Child’s English School Progress Might Take Longer Than You Think

If you are a parent of a child learning English as a second language, you’ve probably had a moment of immense pride watching them chat effortlessly with friends on the playground or order food at a restaurant. They sound great! They’re fluent!

But then, you see their report card or talk to their teacher, and you hear that they are still struggling with reading comprehension or science vocabulary.

It can be confusing and even frustrating. You might wonder: “If they can speak English so well, why are they struggling in class?”

The answer lies in a famous discovery by researcher Jim Cummins called the BICS and CALP distinction. Understanding this is the “secret key” to supporting your child’s education.

The Language Iceberg

Think of your child’s language skills like an iceberg.

1. The Tip of the Iceberg: BICS (Social Language)

BICS stands for Basic Interpersonal Communicative Skills. This is the “surface” language.

• What it is: The English used on the playground, in the cafeteria, or playing video games.
• Why it’s “easier”: It’s “context-embedded.” This means kids have clues to help them—pointing at things, facial expressions, and physical movements.
• How long it takes: Most children pick this up in just 1 to 2 years. They sound “fluent” to the casual listener very quickly.

2. The Deep Water: CALP (School Language)

CALP stands for Cognitive Academic Language Proficiency. This is the “deep” language.

• What it is: The English needed to understand a history textbook, solve a math word problem, or write a persuasive essay.
• Why it’s harder: It’s “context-reduced.” There are no hand gestures or pictures to help. The words are complex (think of words like predict, analyze, or evaporate).
• How long it takes: Research shows it takes 5 to 7 years (and sometimes longer) for a child to catch up to their native-speaking peers in academic language.

Why Does This Matter for You?

The biggest danger is when parents or teachers see a child speaking great “playground English” and assume they are ready to stop receiving extra help.

If a child is moved out of support programs too early, they might “sink” once the schoolwork gets harder in 3rd or 4th grade. They aren’t struggling because they aren’t smart; they are struggling because academic language takes more time.

How You Can Help at Home

The best thing you can do for your child’s English “School Language” is actually to keep speaking your home language!

• Build the Foundation: If your child understands a concept (like how a plant grows) in their first language, they only have to learn a new word for it in English, not a whole new idea.
• Read Together: Read books in your strongest language. Discussing the plot and the characters builds the “thinking muscles” they need for school.
• Be Patient: Remember the 5-to-7-year window. Celebrate the playground “BICS” success, but keep supporting the “CALP” journey for the long haul.

Your child is doing the work of two students at once—learning a new language AND learning school subjects. With time and the right support, they will get there!

Here’s a free information resource on language development and academic progress: download