Объясните употребление времен группы perfect, переведите. 1. this is a very good book, i have just read it with pleasure. 2. he has been absent this week. he has been ill. 3.1 haven't seen you for a long time. where have you been all this time? 4. we haven't heard about her since 1989. 5. by the beginning of the lecture the laboratory assistant had brought all the necessary diagrams. 6. before we came to the next lecture we had studied the material of the first one. 7. have you already finished your diploma work? no, i shall have finished it by the end of june. 8. they will not have passed their exams by the time you return. 9. many students have been enroled into universities this year. 10. the translation has not been finished yet. it will have been finished by the end of the month. 11. have you brought these journals with you? no, these journals had been brought by my sister before i returned from st.petersburg. don't you know that?

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