The answers

The answers1-they have already seen him at the university. (the action has just finished).

2-they have believed her since the beginning.

3-we went to London two years ago.

4-You often come back at the same time.

5-they are the best students I have ever had.

6-there are many girls who do not like sports.

7-you may follow all the advice which he gave you yesterday.

Ex:02

1-are you listening to the radio? .

2-no, you can not turn it off.

3-do you listen to the radio every day? .4-mary went to Canada for a while but she is back now.

5-he has gone out. he will be back in an hour.

6-i did German at school but I have forgotten most of it.

7-normally, I finish work at 5 o'clock but this week I am working until 6 o'clock.

Ex:03

-men

-women-oxen

-teeth

-geese

-mice

-crises

-ladies

-boys

-beliefs

-leaves

-fish-advice

-analyses-buses

-phenomena