初级中学三年级英语 Unit 1Part 3.pptVIP

Unit 1 Smile and Say Hello Language in Use 作为非谓语动词的一种形式, 动词不定式没有 人称和数的变化, 不能在句子中单独作谓语。 ◆动词不定式结构 动词不定式由“to +动词原形”构成(有时可以不带to), 其否定形式是“not + to +动词原形”。 动词不定式 ◆动词不定式在句中所做的成分 不定式可以作句子的主语、表语、宾语、定语、补语、状语或单独使用。 直接把动词不定式置于句首的情况并不多,多 数情况用it作形式主语,把真正的主语动词不定式置于句末,特别是不定式短语较长时。动词不定式作主语时谓语动词用第三人称单数形式。 It’s necessary for you to read English every day. 对你来说每天读英语是必要的。 1. 不定式作主语 有些及物动词常用动词不定式作宾语,此种情况 可按固定搭配或句式去记。 这类动词常见的有agree, decide, come, fail, hope, happen, help, learn, mean, prepare, pretend, seem, plan, offer, remember, forget, try, want等。 I happened to meet Lily on my way home yesterday. 昨天,我在回家的路上碰巧遇见了莉莉。 2. 不定式作宾语 不定式可以和疑问代词who, what, which及疑问副词when, how, where等连用,在句子中作主语、宾语、表语等。 Can you tell me how to make a paper boat? 你能告诉我怎样折一只纸船吗？ 这一结构可以和宾语从句相互转换。 I don’t know what to say. = I don’t know what I should say. 我不知道该说什么。 3. “疑问词+动词不定式”结构 单项选择。 ( )1. —My teacher asks you to speak at the class meeting. —I don’t know ________. A. what should I say B. what to say C. how to say ( )2. My son spends much time and energy _______ online. I must do something to stop him. A. chat B. to chat C. chatting B C ( )3. Remember ________ your parents if you can’t go home and visit them. A. to call B. calling C. call ( )4. —It may be interesting ________ something different every day. —I agree with you. A. do B. doing C. to do ( )5. When you give a warm hand to others, you _________ at the same time. A. are happy B. will be happy C. were happy A C B 按要求完成句子,每空一词。 1. Jackie Chan is a famous actor, and he is also a great singer. (同义句转换) Jackie Chan is ________ ________ a famous actor, ________ ________ a great singer. Jackie Chan is a famous actor, and he is a great singer _______ _______. 2. Let’s make friends. (变为反意疑问句) Let’s make friends, _______ _______? not only but also as well shall