主将从现常见的有以下四种情况:一、如果主句是一般将来时,那么从句常常用一般现在时
如:WhenIgrowup,I’llbeanurseandlookafterpatients
Ifitisfinetomorrow,wewillgoboating
二、如果主句是祈使句,那么从句通常要用一般现在时
如:Don’tlaughatmewhenImakeamistake
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如:Youshouldbequietwhenyouareinthereadingroom
常见的时间状语从句的连词有:assoonas,when,while,as,until等,条件状语从句的连词有:aslongas,unless,if等
Iwilltellhimaboutitwhenhecomes
注意:如果主句的时态是过去将来时,那么从句要用一般过去时
例如:Hesaidthathewouldhaveanothertryifhehadthechance
Iknewhecouldhelpmeifhewasfreethenextday
练习:()1
IfyouwanttolearnEnglishwell,youmustuseitas___aspossible
oftenB
soon()2
---WhatwillBilldoifhe____inthetest
---Hewilltryagain
failsC
willfailD
isfailing()3
Pleasetellherthenewswhenshe_____
OK,Iwill
comesB
willcome
wouldcome()4
Thestudentswillplanttreesifit___tomorrow
didn’tr