第05讲 必修三Unit2 Grammar-【帮课堂】2022-2023学年高一英语同步精品讲义（译林版2020必修第三册）

第02讲 必修三Unit2 Grammar（原卷版）-【帮课堂】2022-2023学年高一英语同步精品讲义（译林版2020必修第三册） 【目标导航】 本单元语法是动词不定式 【知识精讲】 不定式可以作句子的主语、宾语、宾语补足语、表语、定语、状语等成分。 作主语 To hear from you is nice. To be a good teacher is not easy. 不定式作主语时，为了保持句子的平衡，往往以it作形式主语，而不定式置于谓语动词后。 It’s nice to hear from you. It’s not easy to be a good teacher. 作宾语 通常用于afford, agree, aim, arrange, ask, attempt, choose, continue, dare, decide, demand, desire, determine, expect, fail, hate, help, hesitate, hope, intend, learn, long, love, manage, mean, need, offer, plan, prefer, prepare, pretend, promise, prove, refuse, seek, threaten, trouble, wait, want, wish等动词后面。 I forgot to lock the door. Please remember to write to me. 记忆口诀：三个希望两答应（hope，wish，want，agree，promise） 一个要求莫拒绝（demand，refuse） 设法学会做决定（manage，decide） 不要假装在选择（pretend，choose） 作表语 My job is to pick up letters. He seemed to have heard nothing. 作定语 在the first, the second, the third, the last等之后通常接不定式作定语。作定语时须放在被修饰的名词之后： He is always the first one to get up. I have a few words to say on this question. 主动形式表被动含义： I have a book to read. It is easy to read. Have you anything to send? 比较：Have you anything to be sent? She is the last to come. He is looking for a room to live in. There is nothing to worry about. 作宾补 通常用于advise, allow, ask, beg, cause, challenge, convince, enable, encourage, expect, forbid, force, instruct, invite, order, permit, persuade, recommend, remind, request, require, teach, tell, train, urge, want, warn等词后。 He ordered her to leave at once. He was forced to obey his mother’s order. 作状语 不定式作状语时通常表示目的，不定式用作目的状语有两个可能的位置，一是在句首，二是在句末。一般说来，用于句首属于强调性用法，即强调动词的目的。也可用于“be adj. to do”结构中作原因状语。 He got up early to catch the first bus. To finish the task on time, we have to work hard. I’m happy to hear the news. I’m surprised to see him here. only to...往往表示“意想不到”的结果；never to...可以接后续的结果。so...as to..., such... as to..., enough to..., only to...以及too...to...等结构中的不定式也表结果： Her father disappeared, never to be heard again. I went to t