Question

If I were a boy, I __understand. a) can b) could c) could have
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Answer 1

Step-by-step explanation:

b) could

So, let's check out this sentence to see if it makes sense other than the options provided.

If I were a boy, I could understand.

If I were a boy, I can understand.

If I were a boy, I could have understand.

So, option B is your answer and it makes sense in the sentence. It also makes for proper grammar.