谁给我简单讲下IF条件句I don’t know if Jack .If he ,call me,please.A.will come; will comes B.comes; comeC.comes; will come D.will come; comes A moment,please.I'm checking if Mr.Smith _________ free tomorrow.A.is B.being C.to be D

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谁给我简单讲下IF条件句Idon’tknowifJack.Ifhe,callme,please.A.willcome;willcomesB.comes;comeC.comes;willcomeD.wi

谁给我简单讲下IF条件句I don’t know if Jack .If he ,call me,please.A.will come; will comes B.comes; comeC.comes; will come D.will come; comes A moment,please.I'm checking if Mr.Smith _________ free tomorrow.A.is B.being C.to be D
谁给我简单讲下IF条件句
I don’t know if Jack .If he ,call me,please.
A.will come; will comes B.comes; come
C.comes; will come D.will come; comes
A moment,please.I'm checking if Mr.Smith _________ free tomorrow.
A.is B.being C.to be D.will be
Auatar(阿凡达)is such _________ wonderful science fiction movie that I want to see it _________ second time.
A.a,a B.a,the C./,the D./,a
第三个是和IF没关系,帮解释下每题原因 答案是DDA,我想知道的是IF IF的意思我懂,

谁给我简单讲下IF条件句I don’t know if Jack .If he ,call me,please.A.will come; will comes B.comes; comeC.comes; will come D.will come; comes A moment,please.I'm checking if Mr.Smith _________ free tomorrow.A.is B.being C.to be D
1. D
第一个if是宾语从句的引导词,意思是“是否”.从句时态根据句意应该是一般将来时,所以是will come;
第二个if是条件状语从句的引导词,意思是“如果”.根据时态的“主将从现”原则,所以是comes.
2. D
同理,此处的if是表语从句的引导词,意思是“是否”.从句时态应该根据实际情况来确定.从句中含有tomorrow,所以其为一般将来时,所以用will be.
3. A
movie是可数名词,所以第一空必须有冠词a,排除CD;
a second time意思是“再次/又一次”,可以单独做状语.
而the second time意思是“第二次”,不能单独做状语,需加上介词for才可以.由此排除B.
总结:如果if“如果”引导条件状语从句的话,则主从句时态遵循“主将从现”的原则;
如果if“是否”引导宾语从句的话,则从句时态必须根据主句时态和实际情况来确定.
如:I don't know if he is a student.
而:I didn't know if he was a student.

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