Ex. 27. Употребите глаголы, данные в скобках, в Present Perfect:1. I (speak) to him about it several times.2. We (learn) many new words in this course.3. He (make) that same mistake several times.4. I (hear) that story before.5. I am afraid that I (lose) my car keys. Ex. 28. Употребите глаголы, данные в скобках, в Past Perfect:1. I was sure that I (see) the man before.2. I asked him why he (leave) the party so early.3. It was clear that he (give) us the wrong address.4. The teacher corrected the exercises which I (prepare).5. He knew that he (make) a serious mistake.

Ex. 27. Употребите глаголы, данные в скобках, в Present Perfect:
1.    I have spoken to him about it several times.
2.    We have learnt many new words in this course.
3.    He has made that same mistake several times.
4.    I have heard that story before.
5.    I am afraid that I have lost my car keys.
Ex. 28. Употребите глаголы, данные в скобках, в Past Perfect:
1.    I was sure that I had seen the man before.
2.    I asked him why he had left the party so early.
3.    It was clear that he had given us the wrong address.
4.    The teacher corrected the exercises which I had prepared.
5.    He knew that he had made a serious mistake.