Rewrite the sentences in the passive.1.leonardo da vinci painted the mona lisa.2.the prime minister will open the new museum.3.the mayor has announced the winners.4.the egyptians built the pyramids.5.the secretary has sent the email.

I.
1) I have never swum in the sea.
2) he has just come home from work.
3) We have already finished doing home work.
4) Have you ever tried indian food?
5) My sister has never flown in a plane.

B.
1) will go / have
2) go / will buy
3) will take / fits
4) don't have / will pay
5) will buy / make

C.
1) I'm going to play tennis.
2) We are going to sleep.
3) He is going to do homework.

III.
1) was having / rang
2) ran / was talking
3) was drawing / came
4) was sunbathing / jumped
5) were you doing / was watching

IV.
1) the happiest
2) the biggest / bigger
3) the best / better
4) most interesting / more interesting
5) the worst / worse

1. is taking / has been taking;
2. are playing / have been playing;
3. have been learning / is improving;
4. is coming;
5. has been staying / is trying;
6. is working / is preparing / has been writing;
7. is doing;
8. Are they still discussing? / have been discussing
9. are going up / have been rising
10. is blowing / has been blowing
Present Continuous (am/is/are глагол+ing) используется для выражения действия, которое происходит в данный момент, или для запланированных действий (например, в №4).
Present Perfect Continuous (have/has been глагол+ing) используется для выражения действия, которое началось в и продолжается до настоящего момента, т.е. еще не закончилось).