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if后面接什么时态(asif后面接什么时态)

更新时间:2022-04-21 20:55:26 点击: 来源:yutu

  if有如果,倘若等意思,那么if后面接什么时态呢?下面是学习啦小编为你整理的if后面接的时态的相关资料,希望大家喜欢!

  if后接的时态

  一般现在时if后面接什么时态(asif后面接什么时态)

  1. 当if后面接一般现在时的动词时,表示对将来的一种推测. if sb do sth sb will/shall do sth. If you go with me, you shall be rewarded.

  2. 当if后面接一般过去时的动词时,则是一种虚拟语气. if sb did sth sb...

  if从句的时态

  if有两个意思:“是否”和“如果”.

  当做“是否”讲时一般引导宾语从句,时态依据时间状语来做决定,

  如:I don't know if he will come tomorrow.

  当做“如果”讲的时候,又分为两种情形:

  1.真实性条件状语从句,此时遵循“主将从现”原则,即主句用将来时,而if条件状语从句用一般现在时来代替将来时.

  如:If it doesn't rain tomorrow,I will go shopping with my friends.

  2.虚拟性条件状语从句,初中阶段常接触对现在和对将来的虚拟,此时主句多用过去将来时(would+动词原形),而从句用一般过去时(V-ed).

  如:If I knew his telephone number,I would tell you.

  if从句的三种用法

  1、主将从现 (主句为一般将来时,从句为一般现在时);

  eg:If it rains(从句) ,I will stay at home(主句).

  =I will stay at home if it rains.

  2、主句含有情态动词 (must、may、can etc.)从句为一般现在时;

  eg:If you drive too fast ,you may have an accident.

  =You may have an accident if you drive too fast

  3、主句为祈使句,从句要用一般现在时态;

  eg:Don't play computer games if you don't finish your homework.

  备注:

  1、If 于句首时中间用逗号隔开,主句后不用逗号.

  2、if 可用unless(除非...) 替换.unless= if...not...

  3、注意虚拟语气 主句和从句都为一般过去式

  eg:If I was a bird ,I could fly.(事实我不可能是鸟)

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