1)put the verbs into the brackets in the past indefinite tense:
1. he (to listen) to the lecturer very attentively.
2. these students (to get) grants.
3. they (to work) for a master degree.
2)put the verb of the sentence into the past indefinite tense, using modal
verbs and their equivalents:
1. не must work hard to finish his experiment.
2. i can devote myself to scientific work.
3. you may repeat your experiment.
3)choose the right form of the verb to be
1. these results (will be, are, were) very important.
2. a lot of different courses (were, are, will be) offered at our institute next year.
3. lectures (will be, are, were) very important constituents of teaching process.