一般现在时_现在进行时_现在完成时_现在完成进行时概要.ppt

Unit 1 Grammar Overview of tenses1:present tenses Present tenses are used to talk about the present time. These tenses include: simple present present continuous present perfect present perfect continuous we use the simple present tense to talk about things that: 1.I am at a comedy show. 2.The sun rises in the east. 3.The Academy Award show is on television every year. 4.Every time a prop comedian tells a joke, he or she uses a thing, called a prop. are true now or are always true. occur regularly 1这里很少下雪 2他喜爱体育运动 3太阳从东方升起 4他总是乐于助人 1.It seldom snows here. 2. He loves sports. 3.The sun rises in the east. 4.He is always ready to help others. Time marker: usually; always; seldom; often; sometimes; frequently; every day; every week; on sundays Note 1: 1.He is always making trouble. 2.He is constantly leaving his things about. 3.You are always changing your mind. Eg.他总是想着别人 He is always thinking of others. Note 2 1.It’ll be a long time before we ______(meet) again. 2.Even if it ______(rain) tomorrow, we’ll go. 3.I’ll call on you unless it ______(rain) tomorrow. 4.I’ll stay with you so long as there_______(be) is a room free. meet rains rains is 在时间，条件，让步,方式状语从句中，用一般 现在时代替一般将来时，现在完成时，代替 将来完成时 eg.公共汽车未停稳，别下车。 Don’t get off the bus until it has stopped. Note 3 1.The plane takes off at 10 a.m.tomorrow. 2.We leave for Beijing next week. 3.The film starts at 7 p.m. this evening 4.My birthday is in two week’s time. 表按照安排，计划或时刻表， 用一般现在时代替一般将来时 Eg. 早班车7点 The early bus leaves at 7 a.m. Note 4 1.Look! Here comes the bus! 2.There goes the bell! 在here/there引导的倒装句中， 用一般现在时代替现在进行时 1.= The bus is coming here. 2.=The bell is ringing We use the present continuous tense to talk about actions that: 1.are happening or in progress now. are being planned now, but will happen in the future. 2.happen repeatedly, used with always, usually with a negative connotation. 3.You look lovely when you are smiling. 1看！猴子正在爬树