专题三:句法1
状语从句一、考点精要【授之以渔】①从属连词引导的状语从句:since,once,while,as,before,after,until,suppose,however,incase等
②名词词组和副词引导的状语从句:themoment,theinstant,theminute,thefirsttime,eachtime,everytime,immediately等
③近几年以对时间、条件、让步和结果状语从句的考查最为频繁,重点考查的连词:when,before,unless,aslongas,however等
条件状语从句【巧点妙拨】1
由if,unless,ifonly,once,so/aslongas,supposing(that)(假设),incase,so/asfaras,onconditionthat,provided/providingthat引导
Iwon’tgounlessI’minvited
除非我被邀请否则我不会去
“祈使句+and/or/orelse/otherwise+陈述句”的句型中,祈使句在意义上相当于条件状语从句
Useyourhead,andyou’llfindaway
动动脑子你就会想到办法
条件状语从句中一般要用一般现在时态表将来
Oncetheybecomedirty,thelakesarenotabletocleanthemselves
句意:这些湖水一旦变脏,它们就不能自动清洁
解析:考查条件状语从句的连接词
让步状语从句【巧点妙拨】1
though,although这两个连词用法基本相同,只是前者口语化,后者较正式,常位于句首,都不与but连用,但可以和yet,still,nevertheless连用
though还可作副词单独放在句尾,表示“然而”的意思
AlthoughtheTVseti