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學(xué)習(xí)啦 > 學(xué)習(xí)英語(yǔ) > 生活英語(yǔ) > 實(shí)用英語(yǔ) > if后面接什么時(shí)態(tài)

if后面接什么時(shí)態(tài)

時(shí)間: 桂香1115 分享

if后面接什么時(shí)態(tài)

  if有如果,倘若等意思,那么if后面接什么時(shí)態(tài)呢?下面是學(xué)習(xí)啦小編為你整理的if后面接的時(shí)態(tài)的相關(guān)資料,希望大家喜歡!

  if后接的時(shí)態(tài)

  一般現(xiàn)在時(shí)

  1. 當(dāng)if后面接一般現(xiàn)在時(shí)的動(dòng)詞時(shí),表示對(duì)將來(lái)的一種推測(cè). if sb do sth sb will/shall do sth. If you go with me, you shall be rewarded.

  2. 當(dāng)if后面接一般過去時(shí)的動(dòng)詞時(shí),則是一種虛擬語(yǔ)氣. if sb did sth sb...

  if從句的時(shí)態(tài)

  if有兩個(gè)意思:“是否”和“如果”.

  當(dāng)做“是否”講時(shí)一般引導(dǎo)賓語(yǔ)從句,時(shí)態(tài)依據(jù)時(shí)間狀語(yǔ)來(lái)做決定,

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

  當(dāng)做“如果”講的時(shí)候,又分為兩種情形:

  1.真實(shí)性條件狀語(yǔ)從句,此時(shí)遵循“主將從現(xiàn)”原則,即主句用將來(lái)時(shí),而if條件狀語(yǔ)從句用一般現(xiàn)在時(shí)來(lái)代替將來(lái)時(shí).

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

  2.虛擬性條件狀語(yǔ)從句,初中階段常接觸對(duì)現(xiàn)在和對(duì)將來(lái)的虛擬,此時(shí)主句多用過去將來(lái)時(shí)(would+動(dòng)詞原形),而從句用一般過去時(shí)(V-ed).

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

  if從句的三種用法

  1、主將從現(xiàn) (主句為一般將來(lái)時(shí),從句為一般現(xiàn)在時(shí));

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

  =I will stay at home if it rains.

  2、主句含有情態(tài)動(dòng)詞 (must、may、can etc.)從句為一般現(xiàn)在時(shí);

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

  =You may have an accident if you drive too fast

  3、主句為祈使句,從句要用一般現(xiàn)在時(shí)態(tài);

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

  備注:

  1、If 于句首時(shí)中間用逗號(hào)隔開,主句后不用逗號(hào).

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

  3、注意虛擬語(yǔ)氣 主句和從句都為一般過去式

  eg:If I was a bird ,I could fly.(事實(shí)我不可能是鳥)

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