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.

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 have carried out a lot of experiments before they get positive results. 5. it   has 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 been   knowing her? i have been knowing her for three years. 8. last night my friends and i   decided to stay in town for i lie summer. 9. they   discovered diamonds in south africa in the 19th century. 10. the concept of the atom has not to existed before 1804.

1. people will live...

2. children will go...

3. cars will run...

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