- Joined
- Mar 4, 2017
- Member Type
- Student or Learner
- Native Language
- Chinese
- Home Country
- Taiwan
- Current Location
- Taiwan
continuously.Simultaneously?
continuously.Simultaneously?
a. I've written a letter since lunchtime.
b. I've written a letter for an hour.
c. I've written six letters since lunchtime.
d. I've written six letters for an hour.
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Could you tell me which ones are incorrect or unnatural?
Could you tell me the reason?
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