助动词be的用法

助动词be的用法 .3 助动词be的用法 1) be +现在分词，构成进行时态，例如: They are having a meeting. 他们正在开会。 English is becoming more and more important. 英语现在越来越重要。 2) be + 过去分词，构成被动语态，例如: The window was broken by Tom.. 窗户是汤姆打碎的。 English is taught throughout the world. 世界各地都教英语。 3) be + 动词不定式，可示下列内容: a. 表示最近、未来的计划或安排，例如: He is to go to New York next week.. 他下周要去纽约。 We are to teach the freshpersons. 我们要教新生。 说明: 这种用法也可以说成是一种将来时态表达法。 b. 表示命令，例如: You are to explain this. 对此你要做出解释。 He is to come to the office this afternoon. 要他今天下午来办公室。 c. 征求意见，例如: How am I to answer him? 我该怎样答复他, Who is to go there? 谁该去那儿呢, d. 表示相约、商定，例如: We are to meet at the school gate at seven tomorrow morning. 我们明天早晨7点在校门口集合。 动词 1) 表示动作中状态的词叫做动词。 2) 根据其在句中的功能，动词可分为四类，分别是:实义动词(Notional Verb)、系动词(Link Verb)、助动词(Auxiliary Verb)、情态动词(Modal Verb)。 说明:有些情况下，有些动词是兼类词，例如: We are having a meeting. 我们正在开会。 (having是实义动词。) He has gone to New York. 他已去纽约。 (has是助动词。) 3) 动词根据其后是否带有宾语，可分为两类，分别是:及物动词(Transitive Verb)、不及物动词(Intransitive Verb)，缩写形式分别为vt. 和vi.。 说明:同一动词有时可用作及物动词，有时可用作不及物动词。例如: She can dance and sing. 她能唱歌又能跳舞。(sing在此用作不及物动词。) She can sing many English songs. 她能唱好多首英文歌曲。(sing用作及物动词。) 4) 根据是否受主语的人称和数的限制，可分两类，分别是:限定动词(Finite Verb)、非限定动词(Non-finite Verb)例如: She sings very well. 她唱得很好。(sing受主语she的限制，故用第三人称单数形式sings。) She wants to learn English well. 她想学好英语。(to learn不受主语she的限制，没有词形变化，是非限定动词。 说明:英语中共有三种非限定动词，分别是:动词不定式(Infinitive)、动名词(Gerund)、分词(Participle)。 5) 根据动词的组成形式，可分为三类，分别是:单字词(One-Word Verb)、短语动词(Phrasal Verb)、动词短语(Verbal Phrase)例如: The English language contains many phrasal verbs and verbal phrases. 英语里有许多短语动词和动词短语。(contains是单字动词。) Students should learn to look up new words in dictionaries. 学生们学会查字典。(look up是短语动词。) The young ought to take care of the old. 年轻人应照料老人。(take care of是动词短语。) 6)动词有五种形态，分别是:原形(Original Form)、第三人称单数形式(Singular From in Third Personal)、过去式(Past Form)、过去分词(Past Participle)、现在分词(Present Participle)。 .1 动名词作主语、宾语和表语 1)作主语 Fighting broke out between the South and the North. 南方与北方开战了。 2)作宾语 a. 动词后加动名词doing作宾语 V. + doing sth admit 承认 appreciate 感激,赞赏 avoid 避免 complete 完成 consider 认为 delay 耽误 deny 否认 detest 讨厌 endure 忍受 enjoy 喜欢 escape 逃脱 prevent阻止 fancy 想象 finish 完成 imagine 想象 mind 介意 miss 想念 postpone 推迟 practise 训练 recall 回忆 resent 讨厌 resist 抵抗 resume 继续 risk 冒险 suggest 建议 face 面对 include 包括 stand 忍受 understand 理解 forgive 宽恕 keep 继续 举例: (1) Would you mind turning down your radio a little, please? (2) The squirrel was lucky that it just missed being caught. b. 词组后接doing admit to prefer…to be used to lead to devote oneself to object to stick to be busy look forward to to为介词) no good, no use, It's worth…, as well as, can't help, It's no use /good be tired of be fond of be capable of be afraid of be proud of think of / about hold off put off keep on insist on count on / upon set about be successful in good at take up give up burst out prevent … from… 3)作表语 Her job is washing，cleaning and taking care of the children.