If the verb is in the past tense and pres perf if the is in the present perfect tense. 1. I had a problem with my computer yesterday. past
2. We have already seen that movie. pres perf
3. Sami has never hiked to the top of a mountain.
4. They were in the basement during the storm.
5. Lee has been late every day since Monday.
6. Many people cried at the end of the movie.
7. Ann didn’t wait for me at the station.
8. I haven’t begun my homework yet
Объяснение:
предложения, в которых используется частичка have/has, 3 форма глагола, и вс глагол already/yet (не всегда) - это предложения во времени Present Perfact.
Предложения, в которых глаголы стоят во 2 форме, или с частичкой ed - это Past