神马作文网【英语语法：新概念】if引导的条件句（三种情况都要讲出来）?
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【英语语法：新概念】if引导的条件句（三种情况都要讲出来）?
概念?语法?句型?用法?都要完整
（都讲出来才有加悬赏）
概念?语法?句型?用法?都要完整
（都讲出来才有加悬赏）
楼主,你说的是不是虚拟语气呀?
含有if条件句的虚拟语气的构成如下：
1） 对现在虚拟：条件句：一般过去时,主句：could/would/should/ought to/might+动词原形
例：if he were here now,we could have a meeting.如果现在他在这儿,我们就可以开会了.(注意用的是he were.he was也可以,不过虚拟语气里be动词规范的用法还是多以were的形式出现 )
2）对过去虚拟：条件句：过去完成时,主句：could/would/should/ought to/might have done
例：if he had taken my advice,he shouldn't have failed in the exam.如果他听从我的建议,他考试就不会不及格.
3）对将来虚拟：条件句：（1）were to do (2) should do (3)一般过去时 主句：could/would/should/ought to/might +动词原形
例：If i had time/were to have time/should have time,I would visit my parents tomorrow.如果我明天有时间,我就去看望我的父母
含有if条件句的虚拟语气的构成如下：
1） 对现在虚拟：条件句：一般过去时,主句：could/would/should/ought to/might+动词原形
例：if he were here now,we could have a meeting.如果现在他在这儿,我们就可以开会了.(注意用的是he were.he was也可以,不过虚拟语气里be动词规范的用法还是多以were的形式出现 )
2）对过去虚拟：条件句：过去完成时,主句：could/would/should/ought to/might have done
例：if he had taken my advice,he shouldn't have failed in the exam.如果他听从我的建议,他考试就不会不及格.
3）对将来虚拟：条件句：（1）were to do (2) should do (3)一般过去时 主句：could/would/should/ought to/might +动词原形
例：If i had time/were to have time/should have time,I would visit my parents tomorrow.如果我明天有时间,我就去看望我的父母