Question

I (know) know him for a long time.....use correct tense

Answer 1

Answer:

"I have known him for a long time".

Explanation:

The verb given can be applied in many instances depending with which the sentence is written in as long as it is well structured grammatically. Therefore the "first thing" to check when writing a sentence is the tense that the statement constructed in. For instance, the above case, Known is the "best choice" based on the tense that the instructions have stated. However, you can also write the sentence in other tenses using the same word.

Answer 2

have known

Explanation:

it is a past tense