o 不定式(infinitive) 、动名词(gerund) 和分 词(participle) o 不定式和动名词可以做主语、宾语、表语、 补语等, o 分词起形容词和副词作用,可做表语、定语 、状语和复合结构中的复合宾语,但不能做 主语和宾语, 不定式 o 1. 不定式作主语(subject) 时 To help others is our duty. To speak good English is not easy. 注:可将it 形式主语放在主语的位置, 把动词不定式放在句尾。 Its necessary for us to meet again. Its a good idea to draw the fish.宾语(object) o 2. 不定式常常用作某些动词的宾语,如:afford ,agree ,ask ,attempt ,beg ,begin ,bother ,care ,choose ,claim ,consent ,decide ,demand ,desire ,endeavor , expect ,fail ,fear ,hate ,help ,hesita