Grammar: Simple Past vs. Present Perfect

Sarah has become a great piano player _____ she started playing 5 years ago.

since

I _____ to San Francisco twice last month.

went

Sarah has played the piano for 5 years. When did Sarah start playing the piano?

5 years ago

Which complete sentence is incorrect?

I have been to school yesterday.

I have seen that movie _____.

a few times

Present perfect is used to talk about things that started and _____ true now.

are still

We _____ use both present perfect and past simple to talk about the number of times a past event happened.

can

Current UCD students should say, "I _____ at UCD for X years."

have studied

I _____ to Davis last year.

moved (simple past)

I lived in China for 5 years. Do I still live in China?

no