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1. The vegetables have been boiling since 10 oclock. Have the vegetables been boiling since 10 oclock? The vegetables have not been boiling since 10 oclock

2. He has been waiting for her answer for six months. Has he been waiting for her answer for six months? He hasn't been waiting for her answer for six months.

3. My sister has been sending job applications for 3 months. Has ny sister been sending job applications for 3 months. My sister hasn't been sending job applications for 3 months.

4. I have been trying to find my documents since last Sunday. Have I  been trying to find my documents since last Sunday? I havn't been trying to find my documents since last Sunday.

5. They have been learning Japanese for a couple of years. Have they been learning Japanese for a couple of years? They havn't been learning Japanese for a couple of years.

6. Father has been drilling holes in the wall since noon. Has father been drilling holes in the wall since noon? Father hasn't been drilling holes in the wall since noon.

7. My brother has been playing computer games for 3 hours.