. Where is Nick? He . just. (go) out of the office. 2. I can’t find my key. I think I. (lose) it. 3....

1. Where is Nick? He has just gone out of the office.
2. I can’t find my key. I think I have lost it.
3. What are you going to do tonight? Have you decided yet?
4. Wait a minute! They have not finished their work yet.
5. I miss her. She has not been at home for ages.
6. What’s in the newspaper today? I have not read it yet.
7. I’m looking for Bob. Where has he gone?
8. She is having her birthday today. She has already invited us.
9. We are waiting for you. Mum has already cooked the dinner.
10. My family is on holiday. They have gone to France.
11. Her face is familiar to me but I have forgotten her name.
12. Have you ever been to Scotland? It’s a wonderful country!
13. We are going to the restaurant tonight. He has reserved the table.
14. It’s good for your health that you have given up smoking.
15. — Do you like caviar? — I don’t know, I have never eaten it.

1. Where is Nick? He has just gone out of the office.

Explanation: The phrase "has just gone" indicates an action that has recently been completed, which is appropriate here because Nick has only recently left the office.

1. I can’t find my key. I think I have lost it.

Explanation: "Have lost" is used to express an action that has relevance to the present situation. The speaker cannot find their key right now, which implies that it has been lost at some point before now.

1. What are you going to do tonight? Have you decided yet?

Explanation: "Have you decided" is a present perfect question that asks about a decision made at some unspecified time before now. The word "yet" often accompanies the present perfect form.

1. Wait a minute! They have not finished their work yet.

Explanation: "Have not finished" is used to indicate that the work is still incomplete up to the present moment. "Yet" signals that the action is expected to be completed but hasn't been so far.

1. I miss her. She has not been at home for ages.

Explanation: "Has not been" suggests that for a long period up to the present, she has not been home. "For ages" emphasizes the extended duration of her absence.

1. What’s in the newspaper today? I have not read it yet.

Explanation: "Have not read" conveys that the action of reading the newspaper has not occurred up to the present moment. "Yet" again emphasizes the expectation of completion.

1. I’m looking for Bob. Where has he gone?

Explanation: "Has he gone" is used to inquire about Bob's current location, indicating that he has left for some place not specified.

1. She is having her birthday today. She has already invited us.

Explanation: "Has already invited" indicates that the action of inviting has been completed before the current moment. "Already" emphasizes that the action took place sooner than expected.

1. We are waiting for you. Mum has already cooked the dinner.

Explanation: "Has already cooked" implies that the action of cooking dinner has been completed before now, and "already" emphasizes its early completion.

1. My family is on holiday. They have gone to France.

Explanation: "Have gone" indicates that the family is currently in France, having traveled there sometime before now.

1. Her face is familiar to me but I have forgotten her name.

Explanation: "Have forgotten" is used to express that the speaker cannot recall the name at the present moment, implying the forgetting happened at some undefined time in the past.

1. Have you ever been to Scotland? It’s a wonderful country!

Explanation: "Have you ever been" asks about any occasion in the past up to the present when the person might have visited Scotland. "Ever" is used to refer to any time in the past.

1. We are going to the restaurant tonight. He has reserved the table.

Explanation: "Has reserved" indicates that the action of reserving the table has been completed at some point before now and is relevant to the present plan.

1. It’s good for your health that you have given up smoking.

Explanation: "Have given up" suggests that the person stopped smoking at some time before now, and this action continues to have a positive effect on their health.

1. — Do you like caviar? — I don’t know, I have never eaten it.

Explanation: "Have never eaten" indicates that up to the present moment, the person has never had the experience of eating caviar. "Never" emphasizes the lack of this experience in the past.