摘要：省略作宾语的不定式短语.只保留to. e.g. ---- Are you going there? ---- I’d like to . He did not give me the chance, though he had promised to . 注意:如果该宾语是be动词或完成时态.则须在to之后加上be或have. e.g. ---- Are you an engineer? ---- No, but I want to be. ---- He hasn’t finished the task yet. ---- Well, he ought to have.
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把下列句子中的从句改为不定式短语。
1. There are still a lot of difficulties we have to overcome.
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2. Before the machines leave the factory, there is a series of tests that must be passed.
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3. At the end of the speech he expressed the desire that he should come and work in China someday.
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4. They signed an agreement that they should expand the trade between the two countries.
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5. The commander gave orders that we should cross the river.
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6. She was excited when she heard the news.
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7. I'm glad I have seen your mother.
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8. The mother was pleased when she saw her son doing so well at school.
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9. He was very happy when he saw us so happy.
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10. They will be disappointed when they hear it.
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2. Before the machines leave the factory, there is a series of tests that must be passed.
________________________________________________________________________________
3. At the end of the speech he expressed the desire that he should come and work in China someday.
________________________________________________________________________________
4. They signed an agreement that they should expand the trade between the two countries.
________________________________________________________________________________
5. The commander gave orders that we should cross the river.
________________________________________________________________________________
6. She was excited when she heard the news.
________________________________________________________________________________
7. I'm glad I have seen your mother.
________________________________________________________________________________
8. The mother was pleased when she saw her son doing so well at school.
________________________________________________________________________________
9. He was very happy when he saw us so happy.
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10. They will be disappointed when they hear it.
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动词不定式可以充当________以外的所有成份；不定式作主语或宾语时，常用________形式主语或形式宾语；在see, hear, watch, feel, notice, observe, make, let, have, listen to, look at等词后的补足语中，不定式不带to，但是这些句子如果变成被动结构，就必须带________；动词不定式在介词________，________，________后面时，如果这些介词之前有行为动词do的各种形式，那么，这些介词后的不定式不带to，否则要带to。