1. Adam says he (has known/knows) Mr Cooper for 20 years.
2. So, Arnold is not here yet. How long (were you waiting/have you been waiting) for him?
3. Jacob can't join you. He is in bed. He (has fallen/ had been falling) ill.
4. Sorry, it's my fault. I (Have broken/have been breaking) your favourite cup.
5. Ethel (lying/has been lying) in bed all day. What's the matter?
6. My grandmother (has stopped/ has been stopping) working lately
7. Jane (has written/has been writing) this poem herself. I think it's fairly good.
8. I (have done/have been doing) this puzzle for an hour and I can't solve it. 9
9. Where (have you put/have you been putting) my glasses? 10. Your eyes are red. (Have you cried/have you been crying)?​

1. Adam says he (has known) Mr Cooper for 20 years.
Explanation: We use the present perfect tense ("has known") to talk about a past action or experience that has a connection to the present. In this case, Adam's knowing Mr Cooper started in the past and still continues in the present.

2. So, Arnold is not here yet. How long (have you been waiting) for him?
Explanation: We use the present perfect continuous tense ("have you been waiting") to describe an activity that started in the past and is still ongoing in the present. In this case, the person has been waiting for Arnold and is still waiting at the time of asking the question.

3. Jacob can't join you. He is in bed. He (has fallen) ill.
Explanation: We use the present perfect tense ("has fallen") to describe an action or state that happened in the past but has a result or impact on the present. In this case, Jacob fell ill in the past, and the consequence is that he is in bed and unable to join.

4. Sorry, it's my fault. I (have broken) your favorite cup.
Explanation: We use the present perfect tense ("have broken") to talk about a past action that has a result or impact on the present. In this case, the speaker broke the cup in the past, and now there is a broken cup as a result.

5. Ethel (has been lying) in bed all day. What's the matter?
Explanation: We use the present perfect continuous tense ("has been lying") to describe an action that started in the past and is still happening in the present. In this case, Ethel has been lying in bed all day, and the question is asking about the reason for her behavior.

6. My grandmother (has stopped) working lately.
Explanation: We use the present perfect tense ("has stopped") to talk about a past action that has just finished or has a connection to the present. In this case, the grandmother stopped working recently.

7. Jane (has written) this poem herself. I think it's fairly good.
Explanation: We use the present perfect tense ("has written") to talk about a past action or experience that has a connection to the present. In this case, Jane wrote the poem, and it is implied that she did it recently.

8. I (have been doing) this puzzle for an hour, and I can't solve it.
Explanation: We use the present perfect continuous tense ("have been doing") to describe an ongoing action that started in the past and is still happening in the present. In this case, the person has been doing the puzzle for an hour and is still doing it.

9. Where (have you put) my glasses?
Explanation: We use the present perfect tense ("have you put") to talk about a past action that has a result or impact on the present. In this case, the question is asking about the current location of the glasses, indicating that they were put somewhere in the past.

10. Your eyes are red. (Have you been crying)?
Explanation: We use the present perfect continuous tense ("have you been crying") to describe an action that started in the past and is still happening in the present. In this case, the person's red eyes suggest they have been crying recently, and the question is asking for confirmation.