Correct the errors if necessary.
1. This is the first time I am seeing snow.
2. Have you seen the Browns recently?
3. Since what time she has been working for your firm?
4. The children are so dirty! They have played in the garden.
5. How long has he been a doctor?
6. Since I left Britain, I have been returning to visit my friends several times.
7. Right now Phillip has been sitting in this room five hours doing his lessons.

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