II. The present perfect tense.
1Our teachers have explained the English grammar.
2The students have discussed the pollution problems since last week.
3Have the thieves stole the most valuable painting in the national museum?
4Have you finished the above sentences?
5They have given Tom a present.
6The weather has turned all the leaves yellow.
7A famous writer has written that book.
8I have just bought a new pen.
9They have awarded the best student a scholarship.
10They have already reported the result of the exam.
11They have sold thousands of CD machines since 1983
12He has broken his ankle in a football match.
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1 The English grammar has been explained by our teachers
2 The pollution problems have been discussed by the students since last week
3 Has the most valuable painting in the national museum been stolen by the thieves
4 Have the above sentences been finished by you?
5 Tom has been given a present
6 All the leaves have been turned yellow by the weather
7 That book has been written by a famous writer
8 A new pen has just been bought by me
9 The best student has been awarded a scholarship
10 The result of the exam has already been reported
11 Thousands of CD machines have been sold since 1983
12 This ankle has been broken in a football match
