I. Open the brackets. 1. We (to check) our dictations before the teacher (to take) them.

2. Peter said he always (to want) to go to China.

3. Laura (to be) glad that her parents (to phone) her.

4. I (to tell) Rick that I (to give) all the discs to my brother.

5. Antony (to see) Claire yesterday. He (not to see)her in years.

6. Hardly Terry (to open) the door, when his dog (to run) into the house.

7. When they (to see) road accident, they (to call) thepolice.

8. I (not to recognize) Anna because she (to change) greatly.

9. Bob (to be) a shop assistant before he (to become) a businessman.

10. When she (to see) that her child (to tear) the book which she(to buy) for him, she (to be) upset.

II. Correct the errors if necessary.

1. I was sorry that I forgot to phone them.

2. He went to Britain for the first time to study at university.

3.She felt better after she took the medicine.

4. My family had visited three countries last year.

5. It was ten o`clock. He had finished his report.

6. Did they clean the house by 6 o`clock?

7. Last summer Jane went to Turkey.

8. Barry said he didn`t see her before.

9. It stopped raining before we left the house.

10. We had had coffee before we started to work.

I. Open the brackets:
1. We check our dictations before the teacher takes them.
To open the brackets, we simply need to change the verb forms to match the subject and tense of the sentence. In this case, "We" is the subject, so the verb "to check" needs to be in the present simple tense. Similarly, "the teacher" is the subject and the verb "to take" needs to be in the present simple tense as well.

2. Peter said he always wants to go to China.
Again, we need to change the verb form to match the subject and tense of the sentence. Here, "Peter" is the subject and the verb "to want" needs to be in the present simple tense.

3. Laura is glad that her parents phone her.
The verb "to be" needs to be changed to match the subject "Laura" in the present simple tense. The verb "to phone" needs to match the subject "her parents" in the present simple tense as well.

4. I told Rick that I gave all the discs to my brother.
Both verbs "to tell" and "to give" need to be changed to match the subject "I" in the past simple tense.

5. Antony saw Claire yesterday. He didn't see her in years.
The verb "to see" needs to be changed to match the subject "Antony" in the past simple tense. The negation "not" is added before the verb "to see" to indicate that he didn't see her.

6. Hardly Terry opened the door, when his dog ran into the house.
The verb "to open" needs to be changed to match the subject "Terry" in the past simple tense. The verb "to run" also needs to be changed to match the subject "his dog" in the past simple tense.

7. When they saw a road accident, they called the police.
Both verbs "to see" and "to call" need to be changed to match the subject "they" in the past simple tense.

8. I didn't recognize Anna because she changed greatly.
The verb "to recognize" needs to be changed to match the subject "I" in the past simple tense. The verb "to change" also needs to be changed to match the subject "she" in the past simple tense.

9. Bob was a shop assistant before he became a businessman.
Both verbs "to be" and "to become" need to be changed to match the subject "Bob" in the past simple tense.

10. When she saw that her child tore the book which she bought for him, she was upset.
All three verbs "to see," "to tear," and "to buy" need to be changed to match the subject "she" in the past simple tense. The verb "to be" also needs to be changed to match the subject "she" in the past simple tense.

II. Correct the errors if necessary:
1. I was sorry that I had forgotten to phone them.
The verb "to forget" needs to be changed to match the subject "I" in the past perfect tense.

2. He went to Britain for the first time to study at the university.
The article "the" should be added before the noun "university" to specify which university he went to.

3. She felt better after she had taken the medicine.
The verb "to take" needs to be changed to match the subject "she" in the past perfect tense.

4. My family visited three countries last year.
The verb "to have" should be removed, as it is not necessary in this sentence.

5. It was ten o'clock. He has finished his report.
The verb "to finish" should be changed to match the subject "he" in the past simple tense.

6. Did they clean the house by 6 o'clock?
The verb "to clean" is already in the past simple tense, so no changes are needed.

7. Last summer, Jane went to Turkey.
A comma should be added after "summer" to separate the introductory phrase.

8. Barry said he hadn't seen her before.
The verb "to see" needs to be changed to match the subject "he" in the past perfect tense.

9. It had stopped raining before we left the house.
The verb "to stop" needs to be changed to match the subject "it" in the past perfect tense.

10. We had coffee before we started to work.
The verb "to have" should be changed to match the subject "we" in the past simple tense.