Question

Yes, she _______ how to swim .

a) knows
b) known
c) know
d) knowing​

Answer 1

a.knows

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Answer 2

This blank can be filled with the word 'knows'

Correct option - (a)

So, correct sentence will be:-

Yes, she knows how to swim.

Knows is the V5 form of know. This form is used when sentence is in present tense and subject is third person singular.

We can detect whether the sentence is in present, past or future be looking the sentence structure.

Here the second sentence is in simple present tense.

Hence, V5 form of verb will be used that is knows.