eg.1)I'll call you as soon as he ______ (come) back.

　　 2)He won't go to bed until he _________ (finish) his homework.

　　 3)I'll help you if I _____ (be) free tomorrow

　　 4)I ___________ (live) here since I came to China.

　　 (三)原因状语从句:由because, since , for , as引导的从句

　　 eg. He didn't go to school because he was ill.

　　 注意:1)对because引导的从句提问用why

　　 2)因为(because), 所以(so)不能连用

　　 eg. Because he was (A) ill, so (B) he didn't (C) go to school (D) yesterday. ________

　　 (四)结果状语从句:由so that引导的从句(so后接形、副原级)

　　 eg. He ran (A) so faster (B) that I couldn't catch up with (C) him. ________

　　 注意:1) so that +否定句与too to的替换

　　 eg.1)He is so young that he can't go to school.

　　 = He is too young to go to school(主、从句主语相同)

　　 2)He ran so fast that we couldn't catch up with him.

　　 = He ran too fast for us to catch up with. (主、从句主语不同)

　　 3)The box is so heavy that I can't carry it

　　 = The box is too heavy for me to carry.(注意carry后省去宾语it)

　　 2)so that +从句与enough to的替换

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