While giving my exam online, there was a comparison with John. There I found one sentence:
How did John do?
Is it right grammatically? I think John is one person so does should be used. Please explain.
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The sentence is correct; it is the construction of questions in English. With did in past tense you use the do form.
Similarly, you say:
How did he manage to win the race?
That is true with does/present tense also, for example with:
How does Federer play 5 sets without getting tired?
While replying the above mentioned rule of s/es will apply.
He plays with exceptionally good technique.