1. The old man died four years ago. (一般過去時(shí))

The old man has been dead for four years. (現(xiàn)在完成時(shí)，將die變?yōu)?be dead)

The old man has been dead since four years ago. (現(xiàn)在完成時(shí)，since跟過去的時(shí)間點(diǎn))

2. I borrowed the book five days ago.

I have kept the book for five days.

I have kept the book since five days ago.

3. He bought the bike three years ago.

He has had the bike for three years.

He has had the bike since three years ago.

4. She went to school two days ago.

She has been in school for two days.

She has been in school since two days ago.

5. My sister became a nurse one year ago.

My sister has been a nurse for one year.

My sister has been a nurse since one year.

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