遇到困难啦~~大家帮帮忙~~尤其是学过新概念2的朋友们

Join these pairs of sentences with the word given in brackets:
1、(after)she wrote the letter.she went to the post-office
2、(after)he had dinner.he went to the cinema.
3、(when)I fastened my seat-belt.the plane took off.
4、we did not disturb him.(unitl)he finished work.
5、(as soon as)he left the room.I turned on the radio.
6、he was very ill.(before)he died.
怎么变啊~~
词性不用变吗？？？
搞不懂~~~
juxianchen@sina.com!谢谢

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