8. 状语从句

　　a）如果你不……，你就会……    if you don't …， you'll …

　　例︰if you don't keep working hard, you'll lose the chance.

　　如果你不坚持努力工作，你就会失去这次机会。

　　b） 如此 ……，以至于……     so … that …

　　例：at that moment, i was so upset that i wanted to give up.

　　当时，我非常伤心，最后都想放弃了。

　　9. 宾语从句

　　我认为，……  / 我认为……不   i think / i don't think that …

　　我想知道是否……            i wonder whether …

　　例：he doesn't think i should stop him joining the club.

　　他认为我不应该阻止他参加这个俱乐部。

　　10. since + s + 过去式， s + 现在完成式。

　　例：since he went to senior high school, he has worked very har

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