“I know it. I just can’t explain it.” Parents hear this in Mathematics, Science, comprehension and writing. Sometimes the child really does possess useful knowledge but cannot organise it into an answer. Sometimes the feeling of knowing is stronger than the knowledge itself. The distinction matters because the repair is different.
Signs to observe
- The child gives the correct short answer but cannot explain why it is correct.
- They can demonstrate a procedure but struggle to describe the reasoning.
- Oral explanations are much stronger than written responses.
- They use vague words such as “it,” “thing” and “because of that” where precise relationships are needed.
- The child recognises a model answer immediately but cannot produce a similar explanation independently.
- Marks are lost because key evidence, steps or causal links remain unstated.
Test whether the knowledge is really there
Remove the model answer. Ask the child to explain the idea to someone who does not already know it. Then ask one follow-up: “Why?” or “How do you know?” If the explanation collapses immediately, the original knowledge may have been recognition rather than a stable explanatory model.
Separate idea generation from answer construction
A learner may know several relevant facts but not know which belong in the response or how they connect. Ask for the ideas first in rough form. Then identify the relationship the question requires: cause, comparison, evidence, sequence, justification or calculation. Finally construct the answer around that relationship.
Make hidden links explicit
In Science, an answer often fails because a causal step remains inside the learner’s head. In Mathematics, working may jump between two states without showing the reasoning. In comprehension, evidence may be quoted without explaining what it proves. In writing, an idea may be present but poorly organised for the reader.
Ask: “What would the reader need between these two statements?” That question turns communication into a problem of reconstructing missing links rather than adding more words indiscriminately.
Build precision vocabulary
Explanation depends partly on language. Children need words for relationships: increases, decreases, causes, prevents, contrasts, implies, represents, because, therefore, although, whereas. Subject-specific vocabulary matters too. A child cannot communicate a distinction reliably if the language for the distinction is unavailable or insecure.
Use oral rehearsal carefully
If speech is stronger than writing, let the child explain orally first. Then ask them to preserve the same logic in writing. Do not allow the adult to translate the entire explanation for them. The learner needs practice converting their own thinking into a form another person can inspect.
Compare independent output with model answers
Models are most useful after an attempt. Compare the child’s response with a strong answer and identify one missing function: evidence, precision, connection, terminology or conclusion. Then have the child rewrite without copying the model line by line.
Do not call every explanation problem a knowledge problem
Repeatedly reteaching content can waste time when the bottleneck is answer construction. Conversely, teaching answer templates cannot compensate for absent understanding. Test both layers.
When the gap is broad
If difficulty expressing ideas is persistent across settings and forms of communication, significantly interferes with learning, or appears alongside broader language or developmental concerns, share concrete examples with the child’s teachers and seek appropriate qualified assessment where needed. Educational observation should describe the pattern rather than diagnose it.
The useful question is not simply whether the child knows the answer. Ask whether the knowledge is stable, whether the required relationship is understood, and whether the learner can make that relationship visible to another person.