if引导从句的三种时态讲解是什么？
if引导从句的三种时态：
1、提出将来会发生的事。
主句：主语＋would/should/might/could＋动词原形。
从句：should＋动词原形/were to＋动词原形。
2、提出现在的条件。
主句：主语＋would/should/might/could＋动词原形。
从句：动词过去式。
例句：If he studied at this school, he would know the enviornment around the school very much。
3、提出过去的未发生的条件。
主句：主语＋would/should/might/could have＋动词过去分词。
从句：had＋动词过去分词。
例句： If I had read the book, I would have told you about it。
其他条件句：
1、错综时间条件句
有些条件句的主句谓语和从句谓语表示的动作在时间上并不一致，这类句子称为错综时间条件句。
If you had taken my advice then,you would not be in trouble now。
如果当时听我的劝，你现在就不会有麻烦了(if 条件句是对过去的虚拟，故用过去完成时，而主句是对现在的虚拟，故用“would+动词原形”形式）。
2、含蓄条件句
有些句子虽不含条件从句，但意思和条件句相差不多，这种句子称为“含蓄条件句”，这种句子有时候会用虚拟语气。
如: Without air (If there were notair), there would be no living things。
But for your help (If it ha dn'tbeen for your help) I couldn't have don e it。
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