Complete the sentences with one of the following (a, b, c, d) verb forms.
1. By the time we reached the store where he was, he half the stock.
a) bought; b) was buying; c) had bought; d) had been buying
2. I a lot of new clothes recently.
a) am buying; b) buy; c) have been buying; d) have bought
3. The package you for since June has only just arrived.
a) were looking; b) have looked; c) have been looking; d) look
4. We to the opera at least six times last winter.
a) had gone; b) were going; c) went; d) had been going
5. He looked worn out because he all night.
a) had been working; b) worked; c) was working; d) had worked
6. They him when he tries to cross the border
a) will have been shooting; b) will be shooting; c) will shoot; d) will have shot
7. I Greek history since last October.
a) have been studying b) study; c) have studied; d) am studying
8. He to the bus station and didn't stop to talk with us.
a) had hurried; b) had been hurrying; c) hurried; d) was hurrying
9. When she ………….. out of the house, she stopped to admire the roses.
a) had gone'; b) was going; c) went; d) had been going
10. He picked up the book he ………..
a) read; b) had read; c) had been reading; d) was reading
11. John ………… a letter by the window. Tell him he is wanted on the phone.
a) writes; b) has been writing; c) has written; d) is writing
12. I know Peter, we in the same bank.
a) have been working; b) work; c) are working; d) have worked

1. By the time we reached the store where he was, he had bought half the stock.
- The correct verb form here is "had bought". The sentence is referring to an action that was completed in the past before another action took place (reaching the store). The past perfect tense "had bought" is used to show that the buying of the stock was completed before reaching the store.

2. I have bought a lot of new clothes recently.
- The correct verb form here is "have bought". The sentence is referring to an action that started in the past and continues up until the present. The present perfect tense "have bought" is used to indicate an action that occurred at an indefinite time in the past and has an effect on the present.

3. The package you have been looking for since June has only just arrived.
- The correct verb form here is "have been looking". The sentence is referring to an action that started in the past and continues up until the present. The present perfect continuous tense "have been looking" is used to express an action that started in the past, has been ongoing, and just recently ended or has a result in the present.

4. We went to the opera at least six times last winter.
- The correct verb form here is "went". The sentence is referring to a specific action that happened in the past without any connection to the present. The simple past tense "went" is used to express an action that happened and was completed in the past.

5. He looked worn out because he had been working all night.
- The correct verb form here is "had been working". The sentence is referring to an action that was happening continuously in the past before another past action took place. The past perfect continuous tense "had been working" is used to show an action that started in the past, was ongoing, and was then completed before another past event.

6. They will shoot him when he tries to cross the border.
- The correct verb form here is "will shoot". The sentence is referring to a future action or event. The future tense "will shoot" is used to express an action that will happen in the future.

7. I have been studying Greek history since last October.
- The correct verb form here is "have been studying". The sentence is referring to an action that started in the past and continues up until the present. The present perfect continuous tense "have been studying" is used to express an action that started in the past and has been ongoing, with a focus on the duration or repetition of the action.

8. He hurried to the bus station and didn't stop to talk with us.
- The correct verb form here is "hurried". The sentence is referring to a specific action that happened in the past without any connection to the present. The simple past tense "hurried" is used to express an action that happened and was completed in the past.

9. When she had gone out of the house, she stopped to admire the roses.
- The correct verb form here is "had gone". The sentence is referring to an action that was completed in the past before another action took place (stopping to admire the roses). The past perfect tense "had gone" is used to show that the action of going out of the house was completed before stopping to admire the roses.

10. He picked up the book he had been reading.
- The correct verb form here is "had been reading". The sentence is referring to an action that was happening continuously in the past before another past action took place (picking up the book). The past perfect continuous tense "had been reading" is used to show an action that started in the past, was ongoing, and was then completed before another past event.

11. John is writing a letter by the window. Tell him he is wanted on the phone.
- The correct verb form here is "is writing". The sentence is referring to an action happening at the current moment. The present continuous tense "is writing" is used to express an action that is happening right now.

12. I know Peter, we work in the same bank.
- The correct verb form here is "work". The sentence is referring to a general fact or a habitual action. The simple present tense "work" is used to express an action that happens regularly, as a routine or a fact.