It's expression of subjective feelings, contractions, and first-person point of view.(:
1. I’ve seen that film before.
seen would be the correct one in this place, because they have previously seen, and it goes with the abbreviation i’ve!
see is present tense, so we wouldn’t be using it in this case if they have seen it previously, and aren’t watching now!
saw goes with i saw, not i’ve! so i’ve saw would not make sense in this case.
2. Tom hasn’t worked here for long.
not wouldn’t make sense in this case, because it means basically no. it’s like saying tom no work here, we are not trying to say that.
havent wouldn’t make sense either, it is a past/present form talking about what has happened.
3. Where has James put my bag?
this one is the correct one. the others have misplaced words and are not grammatically correct!
hope this helped:)
