2023年中考英语语法专题：非谓语动词之动词不定式（to do)） 课件

动词不定式 可■ 单学单卡 非业表最吸 0 8月 ©田 o00 00000 ◆●⊙ 00000 8 定义：不定式的构成是to+动词原形，当然to有时也 可以省略。动词不定式没有人称和数的变化，可以作除 谓语外的任何成分。 肯定式：to+动词原形 否定式：not to+动词原形 8 日 1.用作主语 A.动词不定式做主语，谓语动词用单数。 eg:眼见为真 To see is to believe. eg:学好英语对我们来说很重要 To learn English well is important for us. 8 B.不定式或不定式短语作主语时，常用t作形式主语，构成 “It+adj.+for sb.+to do sth做某事对某人来说是...” 此时不定式是真正的主语。 eg:It is important for us to learn English well. eg:超速很危险 It's dangerous to drive very fast. 8 注意It+adj.+for sb.+to do sth和It+adj.+ofsb. +to do sth这两个句型的区别 for:描述不定式的行为特征（如：important/easy/interesting) of:描述主语的品质特征（如：kind/nice/friendly/foolish) eg:她能做出这样的事来，她也太蠢了 It's foolish of her to do such a thing. eg:你帮助了我，你真是太好了 It's kind of you to help me. 8 Practice一一用of或for填空 1.It's clever of you to say so. 2.It's impossible for him to finish it. 3.It's wrong of you to tell a lie. 4.It's careless of her to make so many mistakes in the exam. 5.It's necessary for you to learn a foreign language. 8 2.用作宾语（V.+todo) 常用动词不定式作宾语 eg:我想买一台新电脑 I want to buy a new computer. 的动词有：hope, eg:我决定回家 refuse,learn,need, I decide to go home. choose,decide,agree, eg:她希望能找到一份更好的工作 She hopes to find a better job. start,begin,like,try, plan. 8 eg:我认为再和他谈一次是很有必要的 I think it necessary to talk to him again. eg:我发现很难入睡 I found it difficult to fall asleep. think/consider/find it+adj.+todo觉得/认为/发现做. 是怎样的。这里的t是形式宾语，真正的宾语是动词不定式。 日 practice 1.He plans s to go (go)to Beinjing for a holiday. 2.The boy hopes_to pass(pass)the English exam. 3.My parents decide e to give(give)me more money. 4.I'll try my best to help(help)you. 5.I found it hard to give (give)up smoking (smoke). 6.Don't forget t to turn off (turn off)the light. 日3.用作宾补(V.+sb.+todo) 常用动词不定式作 eg:她要我帮她 宾补的动词有： She asked me to help her. want sb to do eg:老师告诉他让他准时来 wish sb to do The teacher told him to come on time. ask sb to do order sb to do eg:汤姆的妈妈教他读英语 Tom's mother taught him to read English. allow sb to do tell sb to do invite sb to do help sb to do