Language grows through use, not lessons alone
A child does not need formal grammar instruction to learn how sentences work. In ordinary conversation, children hear words arranged in many situations, try out patterns, and get responses that help them adjust. Repeated exposure makes those patterns increasingly automatic: a speaker can understand and form complex sentences without consciously applying a rule.
The crucial ingredient is access to a language people can use fully and interactively. That can be a spoken language or a sign language. Watching speech from a distance, hearing fragments, or learning isolated words may provide information, but it is not the same as taking part in sustained communication.
Why a late start can leave a lasting gap
Language-learning capacity changes with development. Early on, the brain is especially ready to organize the sounds or visual signs of a language and connect them to meaning. If a child has little access to any complete language during those years, the missing experience affects more than vocabulary. There may be fewer chances to absorb word order, grammatical relationships, and the conventions that make conversation work.
Later learning can still bring substantial gains. But a person who begins with little or no first-language experience may find that some aspects of fluent language remain difficult, even after years of instruction. That is different from simply learning a second language as an adult: the learner who already has a first language can draw on concepts and communication skills built through it.
Access matters more than the channel
The practical implication is not that a child must be taught one particular language. It is that children need early, regular communication they can understand and participate in. When spoken language is not accessible, a sign language can provide that foundation. The missed opportunity is not a childhood grammar lesson; it is the everyday exchange through which a child learns how language holds ideas together.
