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Put the verbs in brackets into the Present Indefinite, Present Continuous,Present Perfect or Present Continuous Tenses.
1 Helen (to learn) English at the Institute. She (to learn) English since last summer.
2 They are busy now. They (to discuss) an important question. They (to discuss) it since 5'o clock.
3 Where is Peter?-- He (to work) in the library.--He (to work) long?--Yes, he (to work since morning.
4 My brother (to be) in hospital.He (to be) there for ten days.
5 He (to teach) French.He is a very experienced teacher.He (to teach) French for fifteen years.
6 I (to know) Peter well.--Since when you (to know)him? --I(to know)him since 1940.