高中英语知识结构.ppt

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 等表示明确将来时的时间状语连用。 ☆be going to / will的用法之比较： 用于条件句时，be going to表将来，will表意愿。例如： If you are going to make a journey, youd better get ready for it as soon as possible. Now if you will take off your clothes, we will fit the new clothes on you in front of the mirror. ☆be to和be going to 的用法之比较： 　be to 表示客观安排或受人指示而做某事。而be going to 则表示主观的打算或计划。例如： 　I am to play football tomorrow afternoon. (客观安排) 　Im going to play football tomorrow afternoon. (主观安排) 四、现在进行时 　1. 表示现在( 指说话人说话时) 正在发生的事情。例如： We are waiting for you. 　2. 习惯进行：表示长期的或重复性的动作，说话时动作未必正在进行。例如： Mr. Green is writing another novel.　 (说话时并未在写，只处于写作的状态。) She is learning piano under Mr. Smith. 　3. 表示渐变的动词有：get, grow, become, turn, run, go, begin等。 The leaves are turning red. Its getting warmer and warmer. 　4. 与always, constantly, forever 等词连用，表示反复发生的动作或持续存在的状态，往往带有说话人的主观色彩。 You are always changing your mind. 知识扩展：不用进行时的动词 　 1) 事实状态的动词。如：have, belong, possess, cost, owe, exist, include, contain, matter, weigh, measure, continue I have two brothers. This house belongs to my sister. 2) 心理状态的动词。如：know, realize, think see, believe, suppose, imagine, agree, recognize, remember, want, need, forget, prefer, mean, understand, love, hate I need your help. He loves her very much. 3) 瞬间动词。如：accept, receive, complete, finish, give, allow, decide, refuse. I accept your advice. 4) 系动词。如：seem, remain, lie, see, hear, smell, feel, taste, get, become, turn You seem a little tired. 五、过去进行时 1）概念：表示过去某时正在进行的状态或动作。 2）过去进行时的主要用法是描述一件事发生的背景；一个长动作发生的时候，另一个短动作发生。 3) 常用的时间状语有：this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while 例句： My brother fell while he was riding his bicycle and hurt himself. 　 It was raining when they left the station. When I got to the top of the mountain, the sun was shining.　 典型例题 1) Mary ___ a dress when she