
I have been studying English since 1993.
John has helped me since 10:00 this morning.
Those people have been in Europe since August.
Note: Because we are talking about a time in the past until now, we have to use have/has + past participle when we use since.
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Use for + (a length of time) like 1 day, or 3 hours, or 5 years.Examples:
I have been studying English for 4 years.
John has helped me for 8 hours.
Those people went to Europe for 2 months.
Note: It is possible to use the past tense when you use for if the action is finished.

1. Leslie has lived here ten years.
2. I haven't seen you last March.
3. We sat and talked 30 minutes.
4. Young-eun studied French nine years.
5. Caroline has been learning Spanish March 1999.
6. We haven't had an earthquake 23 years.
7. I haven't heard from you Saturday.
8. Molly hasn't eaten 7:00 this morning.
9. He played basketball over 20 years.
10. Andre hasn't seen Becky yesterday.

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