谁能解决一些英语问题?一．Conge the following sentences into the present perfect passive voiceEXAMPLE : We have made a plan .------------------------------------ A plan has been made . 1 My friend has bought a new personal computer. 2 The shop has repaired my computer very quickly. 3 An unknown virus has just attacked my computer.4We have not solved the problem yet. 5 The company has given its computers away to a local school. 6 The scientists have developed a kin

1 A new personal computer has been bought
2 My computer has been repaired very quickly
3 My computer has just been attacked
4 The problem has not yet been solved
5 The company's computers have been given to a local school
6 A kind of intelligent rob has been developed by the scientists

1.A new personal computer has been bought by my friend.
2. My computer has been repaired by the shop very quickly.
3.My computer has been just attacked by an unknown virus.
4. The problem has not been solved yet.
5. The company's computers have been given away to a local school.
6. A kind of intelligent rob has been developed by the scientists.

by后面的部分都可以省略的~
1 A new personal computer has been bought(by my friend)
2 My computer has been repaired very quickly (by the shop)
3 My computer has just been attacked (by an unkown virus)
4 The problem has not been solved yet
5 The company's computers have been given to a local school
6 A kind of intelligent rob has been developed.