英语八年级【知识精讲】9.动词时态(8)主将从现 课件

这是一份英语八年级【知识精讲】9.动词时态(8)主将从现 课件，共18页。PPT课件主要包含了主将从现，时间状语从句，条件状语从句，让步状语从句等内容，欢迎下载使用。

主将从现是指在时间状语从句、条件状语从句和让步状语从句中，如果主句是一般将来时或表示将来含义时，从句用一般现在时替代一般将来时。
常见的有以下三种情况：一、如果主句是一般将来时，那么从句多用一般现在时
When I grw up, I will be a nurse and lk after patients.我长大后要当一名护士，照顾病人。
二、如果主句是祈使句，那么从句通常要用一般现在时
Dn’t laugh at me when I make a mistake.我犯错误的时候不要笑话我。
三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时
Yu shuld be quiet when yu are in the reading rm.在阅览室时应保持安静。
常见的时间状语从句的连接词有: when, until, as sn as 等
Please tell me when he cmes back. = When he cmes back, please tell me.
I will tell him abut it when he cmes.
I’ll wait here until the rain stps. 我将在这里等着，直到雨停。
Yu can’t g hme until yu finish yur wrk.直到你完成你的工作，你才能回家。
As sn as I reach Canada, I will ring yu up. 我一到加拿大，就给你打电话。
常见的条件状语从句的连接词有: if, unless, as lng as
If yu ask him, he will help yu．如果你请他帮忙，他会帮你的。
If yu want t lse weight yu must/shuld eat less bread. 如果你想减肥，你必须少吃面包。
Please call me if he is at hme.
I'll stay here as lng as my mney hlds n.
Yu can't learn English well unless yu wrk hard.
Yu may stay here as lng as yu like.
常见的让步状语从句的连接词有: whether, even if, whatever
Yu'll have t attend the ceremny whether yu're free r busy. 不管你忙不忙，都要参加这个典礼。
They’ll stand by yu even if yu dn’t succeed. 即使你不成功，他们也会支持你。
Even if I have t walk all the way, I’ll get there. 即使我得一路走着去，我也要走到那里。
Whatever yu say, I wn't believe yu.
Whatever yu d, yu shuld d it well.
将下列句子改为由if引导的条件状语从句Yu have prblems. Yu shuld tell yur parents.__________________
将下列句子改为由if引导的条件状语从句Yu have prblems. Yu shuld tell yur parents.__________________答案：If yu have prblems, yu shuld tell yur parents.
将下列各句合并成含有if的条件句。I will g swimming.It wn't be cld tmrrw._____________________________________
将下列各句合并成含有if的条件句。I will g swimming.It wn't be cld tmrrw._____________________________________答案：I will g swimming if it isn't cld tmrrw．