X八（下）Unit2SectionA-4.ppt

动词不定式的否定形式： （1）动词不定式的否定式是直接在to之前加 not. e.g. Tell them not to play football in the street. ?（2）省略to的动词不定式的否定式是直接在 动词前面加not. e.g. Let the boy not go. Homework Review the grammar point we learn today. Find more exercise to practice. Unit 2 I’ll help to clean up the city parks. You could ask hospitals to let you visit the kids and cheer them up. She decided to try out for a volunteer after-school reading program. I’d like to help homeless people. Grammar Focus I’m making some signs to put up around the school. She volunteers there once a week to help kids learn to read. Mario believes it can help him to get his future dream job. 动词不定式 动词不定式是一种非谓语动词形式，在 句中不能作谓语，没有人称和数的变化。 基本形式：to＋动词原形，有时to可以省略； 否定形式：not + 动词不定式。 动词不定式具有名词、形容词和副词的特征，因此可以在句中作主语、宾语、宾语补足 语、定语和状语等。 ??? 一. 作宾语动词不定式（短语）可以放在一些动词后面用作宾语，能以动词不定式作宾语的动词有：begin, want, remember, agree, learn, like, decide, fail, pretend, demand, refuse等。 e.g. I want to tell you a story. They begin to work at eight every morning. Don’t forget to lock the door. Would you like to go and have a picnic with us tomorrow? 二. 作宾语补足语。 e.g. The teacher asked us to read English for half an hour in the morning. The teacher often tells Jim not to spend too much time playing computer games. Please let me help you. ?动词不定式作宾语补足语，表示宾语所做的动作，可以用动词不定式作宾语补足语的动词有：tell, ask, want, like, invite, encourage, help等。 但在let, make, see, watch, hear, feel, notice, have等感官听觉动词或使役动词后面作宾语补足语的动词, 其不定式一般要省略动词不定式符号“to”，可以归纳为以下三种句式： 1.不可以省略to的不定式作宾语补足语：tell /ask / want / would like / wish / suppose / invite /encourage /teach/ depend on等 + sb.+ to do sth. ? e.g.?The teacher told us to come earlier. ? I want you to go now. Her parents wish her to be a teacher. ? ? 2.省“to”的不定式作宾语补足语： ?let / make / have + sb. +do sth. e.g. Let the girl leave here now. The boy made the baby cry. ?see / watch / hear / notice / feel +sb.+do sth. e.g. I saw the