Question

2.5 Present Perfect or Past Perfect. 1. My sister is so upset: she (to lose) the key to the front door. 2. By the 1st of September all the children (to return) from the country. 3. Columbus (not to know) that he (to discover) America. 4. He (to discuss) this problem with a lot of people before he (to take decision). 5. I never (to be) to Greece. 6. She is very happy: her son (to finish) school.

Answer 1

1 has lost

2 had returned

3 . Columbus didn't know that he discovered America

4 discussed,had taken decision

5 I have never been to Greece

6 has finished

Answer 2

Here are the correct verb tenses for each sentence:

1. My sister is so upset: she has lost the key to the front door. (Present Perfect - emphasizes the connection between the past action and the present result)

2. By the 1st of September all the children had returned from the country. (Past Perfect - indicates an action completed before a specific point in the past)

3. Columbus did not know that he had discovered America. (Past Simple for the first action, Past Perfect for the action that happened before it)

4. He had discussed this problem with a lot of people before he took a decision. (Past Perfect for the discussions that happened before the decision)

5. I have never been to Greece. (Present Perfect - indicates an action that started in the past and continues to the present)

6. She is very happy: her son has finished school. (Present Perfect - emphasizes the connection between the past action and the present result)