1. cause → causing
2. stay → staying
3. refer → referring
4. tie → tying
5. travel → travelling

Choose the correct form: have or has and since or for.

1. They have been discussing the problem since one o'clock.
2. The candle has been burning for two hours.
3. Ben has been wearing that blue shirt since Friday.
4. The researcher has been exploring the territory since last December.
5. Judith and her boyfriend have been kissing for ten minutes.

Write sentences in present perfect progressive.

1. the cat / the mouse / chase → The cat has been chasing the mouse.
2. you / the homework / copy → You have been copying the homework.
3. they / a new gadget / invent → They have been inventing a new gadget.
4. we / in a forum / chat / not → We have not been chatting in a forum.
5. Lucy / on the task / concentrate / not → Lucy has not been concentrating on the task.

Write questions in present perfect progressive.

1. Kerry / paint → Has Kerry been painting?
2. the secretary / the documents / print out → Has the secretary been printing out the documents?
3. they / a room / share → Have they been sharing a room?
4. the dog / run around / how long → How long has the dog been running around?
5. you / at the door / knock / how long → How long have you been knocking at the door?

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1. cause → causing
2. stay → staying
3. refer → referring
4. tie → tying
5. travel → traveling

Choose the correct form: have or has and since or for.

1. They have been discussing the problem since one o'clock.
2. The candle has been burning for two hours.
3. Ben has been wearing that blue shirt since Friday.
4. The researcher has been exploring the territory since last December.
5. Judith and her boyfriend have been kissing for ten minutes.

Write sentences in present perfect progressive.

1. the cat / the mouse/chase → The cat has been chasing the mouse.
2. you / the homework / copy → You have been copying the homework.
3. they / a new gadget / invent → They have been inventing a new gadget.
4. we / in a forum/chat /, not → We have not been chatting in a forum.
5. Lucy / on the task/concentrate / not → Lucy has not been concentrating on the task.

Write questions in the present perfect progressive.

1. Kerry / paint → Has Kerry been painting?
2. the secretary / the documents / print out → Has the secretary been printing out the documents?
3. they / a room / share → Have they been sharing a room?
4. the dog / run around / how long → How long has the dog been running around?
5. you / at the door / knock / how long → How long have you been knocking at the door?