Replace the infinitives by the Past Indefinite, the Present Perfect or
Replace the infinitives by the Past Indefinite, the Present Perfect or the Present Perfect Continuous. 1.At last you (to open) the door. I (to ring) for an hour at least, I think. 2. Here you are at last. I (to wait) for you for ten minutes. 3. The workers (to work) hard since Tuesday. 4. The scientists (to carry out) a lot of experiments before they (to get) positive results. 5. It (not to rain) for a long time. 6. He (to work) at this project for a long time and(not to finish) it yet. 7. How long you (to know) her? I (to know) her for three years. 8. Last night my friends and I (to decide) to stay in town for I lie summer. 9. They (to discover) diamonds in South Africa in the 19th century. 10. The concept of the atom (not to exist) before 1804.
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1. At last you have opened the door. I have been ringing for an hour at least, I think.
2. Here you are at last. I have been waiting for you for ten minutes.
3. The workers have been working hard since Tuesday.
4. The scientists had carried out a lot of experiments before they got positive results.
5. It has not been raining for a long time.
6. He has been working at this project for a long time and has not finished it yet.
7. How long have you known her? I have known her for three years.
8. Last night my friends and I decided to stay in town for the summer.
9. They discovered diamonds in South Africa in the 19-th century.
10. The concept of the atom did not exist before 1804.
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