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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