nothing but do还是to do

　　nothing but后面接do或者to do，具体看nothing前面有没有do。首先but是连词，可以连接两句话。一般情况下but后面用to do，若nothing前面有实意动词do(或者do的变性did，does等等)后面就省略to。固定结构是do nothing but do sth 如果前面没有do，结构是：nothing but to do sth。

　　特殊句型

　　1. It's (is/has been) two years since he left China.

　　2. It's (is) the first time that I have visited Shanghai.

　　3. have/has been to … 曾经到过某地

　　have/has gone to … 去了某地

　　4. Where there is a will, there's a way.

　　5. It was not long before I forgot it all.

　　6. need/want/require + to be done/doing

　　7. do nothing but do ; have no choice but to do

　　8. The boy has his own idea of how to finish it.

　　9. He is easy to deal with. / You are lucky to get there on time.

　　10.In order to/ to so as to find a good job, we should study well.

　　11. too… to / enough to do

　　12.He is too young to go to school. / He is old enough to go to school.

　　13. 独立成分:

　　To tell you the truth, … (句子)

　　To be fair, … (句子) / To be frank, … (句子)

　　To be sure, … (句子) / To make matters worse, … (句子)be to do / be about to do / be going to dohad better / best (not) do

　　14. 不得不:

　　cannot but do / cannot choose but do / cannot help but do

　　do nothing (= not do anything) but / except do

　　go / come + do egs. Please come sit here. / Go ask you mum.

　　Why not do? (Why don't you do?)There's no time to do