为什么if从句中的时态和主句不一致?
if后面跟的时态不同的原因及例句如下：
一、if作为连词，引导条件状语从句，它表示的意思是“假如”“如果”等。在复合句中如果主句用将来时，则if引导的状语从句用一般现在时。例如：
1.If itdoesn’train, we will go to the park next Sunday. 如果天不下雨，下周星期天我们将去公园。
2.If you ask him，he will help you．如果你求他，他将会帮助你。
二、用于虚拟语气中，if从句中用过去式，表示不可能实现，大概不会实现或提出作为考虑的假定条件。例如：
1.If you were a bird, you could fly.假使你是只鸟，你便会飞了。
2.If I asked him(if I were to ask him) for a loan，would he agree?如果我向他借贷，他会答应吗?
三、if引导时间状语从句，当if做“当”或“无论何时”解而不含有条件之义时，if从句中的时态与主句中的时态相同。例如：
1.If youmix yellow and blue，you get green．你将黄色与蓝色混合，便会得到绿色。
2.If she wants the servant，she rings the bell．每当她需要仆人时，她便按铃。
扩展资料
1. if和whether在宾语从句中，都表“是否”，可换用，if更口语化，whether正式些。
当有or not时， 一般用whether，而不用if。
He wants to know if/whether you can help him.他想知道你是否能帮助他。
2. if可引起条件状语从句，whether不用于状语从句。
If you work hard, you'll succeed.如果你努力工作，你会成功的。
3. whether可引起主语从句，表语从句，if不能用于这两种情况。
Whether you can finish it in time or not depends on yourself.你能否按时完成取决于你自己。
4. if在名词性从句中只能引导动词后的宾语，whether可通用。
参考资料百度百科-IF
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