"I saw her dance" and "I saw her dancing" - Are they interchangeable?
Is there any difference in meanings?

If you use "watch", you should grammatically say "I watched here dance" (not dancing), correct?

Question

"I saw her dance" and "I saw her dancing" - Are they interchangeable?
Is there any difference in meanings?

If you use "watch", you should grammatically say "I watched here dance" (not dancing), correct?

Answer

Yes, that is all correct. I watched her dance. (no ~ing)

I saw her dance (form beginning to end).
I saw her dancing (in the middle of it).

Almost the same, not quite. A large overlap, too.

Answer

When you say "I watched her dance" it has the feel that the event happened farther in the past. When you say "I watched her dancing" it is more like the imperfect past because it was happening for a while before you stopped watching or that the event is in the more recent past. I hope that makes sense.

Answer

as I know both are correct, dance is a noun, and dancing is a gerund that can replace the noun,

ご自宅で快適に語学を学べるチャンスをお見逃しなく。経験豊富な語学講師陣の中からお選びいただき、今すぐ最初のレッスンにお申し込みください！