Question

He talks as if he ---------(know)everything. CORRECT TENSE

Answer 1

he talks as if he knows everything..

Answer 2

Answer:

He talks as if he knows everything (or) He talks as if he knew everything.  

Explanation:

In the normal way of writing, we generally express it as 'knows' and it is accepted. But in the formal way of writing, we use 'knew' and it is a 'better form' of expression.  

Another explanation can also be given for using 'knew'. If in the sentence, the thought is not real, we can express with 'knew' too. Different tense is all about showing different times.

Expressing different timing is very important. Of the tenses, the present simple tense is the most used tense.