13. Go on planting trees for two more years and the hill will be covered with green trees.

　If we go on planting trees，the hill will_________ _________in two_________ _________.

　答案：12. Don't,or 13. turn green,years' time

　简析：含有祈使句的并列句，可转换为含if条件句的复合句。

12. If you play basketball here，you may break the windows.

　　_________play basketball here,_________you may break the windows.

11. The snow was heavy last night.

　　It_________ _________last night.

　答案：snowed heavily

　简析：句中名词snow和形容词heavy转换成了动词snowed和副词heavily。

10. Mrs. Smith is my teacher. She is also my good friend.

　Mrs. Smith is_________ _________my teacher_________ _________my good friend.

　答案：9. Neither,nor 10.not only,but also

　简析：英语中常用not only... but also，either... or,neither... nor,both... and等连词把两个意义相关的简单句合并成一个简单句。解题过程中要注意连词的选用和主谓一致原则。除此之外，还可用too... to,enough to等把两个简单句合并成另一简单句。如：Tom is young. He can't go to school.→Tom is too young to go to school.

9. Jim doesn't like noodles，and Jack doesn't,either.

　_________Jim_________Jack likes noodles.

8. She spent 30 dollars on the English-Chinese dictionary.

　The 　English-Chinese dictionary __________ ___________ 30 dollars.

　答案：7. took, get 8. cost her

　简析：此类转换必须弄清每个句型的构成特点，而且还要注意句中每个句型的固定搭配。如：give sb. sth.与give sth. to sb.的转换，spend some time(in)doing sth.／on sth.与It takes sb.some time to do sth.的转换等等。

7. Ann spent two weeks getting ready for the exams.

　It ________Ann two weeks to __________ ready for the exams.

6. A computer is more useful than a VCD.

　A VCD is not _________useful _________a computer.

　答案：4. less, than 5. fell behind 6. as，as

　简析：此类转换应注意有时主语位置会改变，并要特别总结归纳反义词(组)。如：new-old, big-small, long-short, more than-less than等。

5. The runner couldn't catch up with the others in the race.

　The runner _________ 　__________ the others in the race.

4. Chinese is more popular than Japanese.

　Japanese is __________ popular __________ Chinese.