（一）介词“in” 的省略大全
在下列短语中,in常被省略
①be busy( in) doing...忙于做....Marry is busy （in）doing her homework.
玛丽正忙于做她的家庭作业。
②have difficulty /trouble/problem( in) doing...…做....有困难/有麻烦/有问题……
I have some difficulties （in ）doing this math problem.做这道数学题我有一些困难。
③( in) this/that way用这种/那种方法（In ）this way, we have learned a lot.
用这种方法，我们学到了许多。
④spend..…( in) doing花费...在做.......Workers spent two years （in） building the building. 工人们花费了两年时间修建了这幢大楼。
⑤have a good time( in)doing .. ..玩得快乐Our classmates had a good time （in ）playing yesterday in the park.
⑥waste...( in)doing...浪费......做……Xiaoming wasted a lot of time （in）making this kite。做这个风拿小明浪费了许多时间。
⑦pass time( in)doing...做...度过时光We passed a good time (in) learning knowledge in school. 我们在学校学习知识度过美好的时光。
⑧kill time( in) doing...消磨时光做....Some young people kill time （in）playing computer games every day.
⑨There's no use/ good( in) doing.…..做....没有用处/好处。
There is no good for our health in eating junk food. 吃垃圾食品对我们的身体没有好处。
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(二) to 作介词时的短语小结1. admit to doing sth 承认做了某事Jack admited to breaking the window.
杰克承认（是他）打破了窗户。
2. object to doing sth 反对做某事They also object to giving the president and his family any immunity from prosecution.
他们还拒绝给予总统及其家人任何免于起诉的特权
3. see to doing sth 负责做某事Li Ming sees to building the building.
李明负责修建这幢大楼。
4. stick to doing sth 坚持做某事My sister insisted to finishing her homework by himself.
我妹妹坚持要独立完成家庭作业。
5. be opposed to doing sth反对做某事Mom is opposed us to playing computer games. 妈妈反对我们玩电脑游戏
6. look forward to doing sth盼望做某事The children are looking forward to the new year.孩子们盼望着新年。
7. be used to doing sth 习惯于做某事My father is used to walking after supper.我父亲习惯于晚饭后散步。
8. reduce sb to doing sth 使某人沦落到去做某事的地步Drug use reduced her to crime吸毒使她堕落到犯罪的地步
9. take to doing sth 喜欢上做某事Mom takes to dancing. 妈妈喜欢上了跳舞。
10. apply oneself to doing sth专心致力于做某事My brother has applied himself to learning English for three years. 我哥哥已经努力学了三年英语了。
11. devote oneself to doing sth献身于做某事Han Hong devoted herself to helping the poor. 韩红致力于帮助穷人。
12. be devoted to doing sth把时间(钱、精力等)花在做某事上She is devoted her life to helping the homeless people. 她一生致力于帮助无家可归的人。
13. get down to doing sth开始做某事，认真处理某事LiHong gets down to learning English.
李红开始认真学习英语。
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