Поставьте глаголы, стоящие в скобках, в зависимости от смысла, в Present Indefinite, Present Continuous, Present Perfect или Present Perfect Continuous:

1. Helen (to learn) English at the Institute. She (to learn) English since last autumn.
2. They are busy now. They (to discuss) an important question. They (to discuss) it since five o'clock.
3. Where is Comrade Petrov? — 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. Comrade Ivanov (to teach) French. He is a very experienced teacher. He (to teach) French lor fifteen years.
6. I (to know) Peter well. — Since when you (to know) him? — I (to know) him since 1940.

1. Helen learns ... (or: is learning ... ); She has been learning ... .
2. ... They are discussing ...; They have been discussing ... .
3. ... He is working ... Has he been working ...; he has been working ... .
4. My brother is ...; He has been ... .
5. Comrade Ivanov teaches ...; ... He has been teaching ... .
6. I know ...; ... have you known ... I have known ... .