Question

he looks as if he (see) a ghost (correct tense)​

Answer 1

Answer:

Ans. He looks as if he had seen a ghost.

Past Perfect Tense.

Answer 2

ANSWER :-

• he looks as if he has seen a ghost

The sentence is simple present tens.

NOTE:- You cannot enunciate this statement as :-

• he looks as if he had seen a ghost.

This is wrong because the sentence already has a present tens word I.e "looks" . That's why you cannot add any past perfect word like "had".

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Hope this will help ya !