2.原因状语,多见于sb.+be+adj.+to do...结构句中。如:
1)My dogs name is Luckya good name for him because I feel very lucky to have him.(p.66)
2)On Monday he told a radio interviewer that he had run out of money to buy old bikes. (p.64)
3.结果状语,多见于too...to,enough to...结构句中。如:
1)Then Im too tired to do well. What should I do?(p.28)
2)The room needs to be big enough for three people to live in.(p.56)
4.有些动词不定式作状语,常说明前面形容词的性质和特性。动词不定式与句子的主语有逻辑的动宾关系。动词不定式前面的形容词一般是:cheap, dangerous, difficult, easy, fun, hard, interesting, necessary。不定式常用主动式表被动意义。
... the mistakes you made are necessary for you to learn and understand.(p.116)
这类句子中的动词不定式可改为主语。
5.独立动词不定式多用作插入语,表示说话人的心理状态或对事情的看法。如:
1)Id like to stay healthy, but to be honest, I only eat food that tastes good.(p.50)
2)To begin with, she spoke too quickly, and I couldnt understand every word. (p.6)
七、动词不定式的复合结构
动词不定式的复合结构是for / of sb. to do sth.,for / of引出不定式动作的逻辑主语。这种结构在句子中可以作主语、宾语、表语、定语、状语等。不定式复合结构的介词用for还是of,主要决定于前面形容词的性质。一般说来,of前面的形容词是careful, clever, foolish, good, kind, nice, wise等,既说明人的特性,又说明不定式动作的特性。for前面的形容词是dangerous, difficult, easy, hard, heavy, important, interesting, necessary等,一般说明不定式动作的特性,不说明人的特性。前面如果是名词用for。如:
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