9动词的时态.ppt

Lecture 9: Verb Tenses 1 一般现在时的用法 1) 经常性或习惯性的动作，常与表示频度的时间状语连用。 I leave home for school at 7 every morning. 2) 客观真理，客观存在，科学事实。 The earth moves around the sun. 注意：此用法如果出现在宾语从句中，即使主句是过去时，从句谓语也要用一般现在时。 例：Columbus proved that the earth is round. 3) 表示格言或警句中。 Pride goes before a fall.　骄者必败。 4) 现在时刻的状态、能力、性格、个性。 I dont want so much. 比较：Now I put the sugar in the cup.　　　I am doing my homework now. 第一句用一般现在时，用于操作演示或指导说明的示范性动作，表示言行的瞬间动作。再如：Now watch me, I switch on the current and stand back. 第二句中的now是进行时的标志，表示正在进行的动作的客观状况，所以后句用一般现在时。 2 一般过去时的用法 1）在确定的过去时间里所发生的动作或存在的状态。 Where did you go just now? 2）表示在过去一段时间内，经常性或习惯性的动作。 When I was a child, I often played football in the street. 3）句型： It is (high) time sb. did sth. “时间已迟了”　 “早该……了”It is (high) time you went to work. It is time for you to go to bed.　 你该睡觉了。 It is time you went to bed.　　　你早该睡觉了。 would (had) rather sb. did sth.　表示‘宁愿某人做某事’I‘d rather you came tomorrow. 4) wish, wonder, think, hope 等用过去时，作试探性的询问、请求、建议等。 I thought you might want some. 我以为你想要一些。 比较： 一般过去时表示的动作或状态都已成为过去，现已不复存在。 Christine was an invalid(病人, 残废者)all her life. (含义：她已不在人间。) Christine has been an invalid all her life. (含义：她现在还活着) Mrs. Darby lived in Kentucky for seven years. (含义：达比太太已不再住在肯塔基州。) Mrs. Darby has lived in Kentucky for seven years. ( 含义：现在还住在肯塔基州，有可能指刚离去) 注意： 用过去时表示现在，表示委婉语气。 1）动词want, hope, wonder, think, intend 等。 I wondered if you could help me. 2）情态动词 could, would. Could you lend me your bike? 3 一般将来时 1) shall用于第一人称，常被will 所代替。 will 在陈述句中用于各人称，在争求意见时常用于第二人称。 Which paragraph shall I read first. Will you be at home at seven this evening? 2) be going to +不定式，表示将来。 a. 主语的意图，即将做某事。 What are you going to do tomorrow? b. 计划，安排要发生的事。 The play is going to be produced next month。 c. 有迹象要发生的事 Look at the dark clouds, there is going to be a storm. 3) be +不定式表将来，按计划或正式安排将发生的事。 We are to discuss the report next Saturday. 4)　be about to +不定式，意为马上做某事。 He is about to leave for Beijing. 注意：be about to 不能与tomorrow, next week 等表