i wanted to know if it's okay to use future perfect (using WOULD not WILL) with Past Simple. i wanted to say if i knew he was ill at a point in the past , i will visit him at this point in the past.


It's understandable, but not quite the normal verb tense you'd want to use.

Instead, it would more commonly be:

If I had known you were ill, I would have visited you.

That describes a past hypothetical.

For a present hypothetical:

If I knew you were ill, I would visit you.

And for the future:

If I know you are ill, I will visit you.

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