㈠1.-Susan, go and join your sister cleaning the yard.
-Why ______ ? John is sitting there doing nothing.
2.—What do you think made the girl so glad?—_____a beautiful necklace.
A．As she received B．Receiving C．Received D．Because of receiving 总结：以上两题只回答了_______,省略了后面的________和________.
3. A great number of students____said they were forced to practise the piano.
A. to question
B. to be questioned
4. Now that we’ve discussed our problem, are people happy with the decisions_____?
D. to take
①5. --Does your brother intends to learn to sing this song? --Yes, he intends ______.
6.—Would you like to have some cakes ? --thank you._________.
A. I’d like to
B. I’d like to have
C. I’m full
D. I’d better to home
这类动词有：expect,forget,hope,intend,mean,prefer,refuse,try,want,wish,would like 和love等
②在have to, need, ought to, be going to, used to等后省略动词,在happy，glad，eager，ready，willing等形容词后面作状语时，可以省略，但要保留不定式符号to。如：
③7. —He hasn’t gone to the office up to now.—Well, he_____.
A．should B．ought to C．ought to go D．ought to have
总结：当___________中带be, have, have been 等，通常要保留_____ ____ ______
例The boy did nothing but__play_________. （play）
The boy said nothing but __to play______ . (play)
⑤某些使役动词（let, make, have）及感官动词（see, watch, hear, notice, observe, feel, look at, listen to等）后面作宾语补足语的不定式一定要省去to, 但在被动语态中须将______复原。例I saw the boy ___fall______ from the tree. （fall）The boy was seen ___to_fall__ from the tree. (fall)
The boss made us _work________12 hours a day. （work）
We were made _to_work_______ 12 hours a day. （work）
1) 通常情况下，在省略了某个词、短语或句子时，还需要用某个替代词。常用的替代词有：do /does /did, so, not, neither, nor和the same等。用助动词do /does /did 来替代上下文出现的动词，以免重复。如：She speaks English more fluently than her elder sister does.