whic sentence is more natural;
1. I haven't seen Ali till now.
2. I haven't seen Ali so far

Question

Answer

1. sounds like you ARE seeing him now.
2. is most natural, if you mean that you still haven't seen him.

Answer

They are both good but have different meanings.

Say #1 if you now see Ali or expect to see him very soon (like in the next 30 minutes)

Say #2 if you do not yet see Ali but may see him in the future.

Answer

2

Answer

Depending on what you mean, I would instead say, “I haven’t seen Ali yet (today, this morning, ec.).”