英语语法简介：虚拟时态

英语语义云端及物动词是一种指出非现实、假定、心愿、建议等状况的语义表达方式。云端及物动词通常用在条件句、词语性从句、特殊字词或句型中的，须要根据有所不同的情境选择有所不同的云端表达方式。

根据与或许反之亦然的程度，云端及物动词可以分为三种：

与现在或许反之亦然的云端：如果假定的状况与现在的或许不原则上，须要用过往时（be助词用were）指出云端，主语用would/could/should/might+助词模样指出结果。例如：

If I were you, I would study hard.（如果我是你，我但会学起。）

If he knew it now, he could help me.（如果他现在知道，他就能帮我。）

与过往或许反之亦然的云端：如果假定的状况与过往的或许不原则上，须要用过往完成时（had+现在时）指出云端，主语用would/could/should/might+he+现在时指出结果。例如：

If I had studied hard, I would he passed the exam.（如果我学起了，我就但会通过科目。）

If she had seen him yesterday, she might he told him the truth.（如果她昨日碰到了他，她可能但会告诉他真相。）

与今后或许反之亦然的云端：如果假定的状况与今后的或许不原则上，须要用过往时（be助词用were）或should/were to+助词模样指出云端，主语用would/could/should/might+助词模样指出结果。例如：

If it rained tomorrow, I would stay at home.（如果明天下雨，我但会呆在家里。）

If he were to go to the moon one day, he could see it with his own eyes.（如果他竟然去金星，他就能亲眼看到它。）

请求用备注中的的正确表达方式填空：

If I __________ (be) you, I __________ (not do) that.

If he __________ (study) harder, he __________ (pass) the exam.

If she __________ (not lee) so early, she __________ (meet) him.

If it __________ (snow) tomorrow, we __________ (make) a snowman.

If they __________ (win) the lottery, they __________ (trel) around the world.

正确：

If I were you, I would not do that.

If he had studied harder, he would he passed the exam.

If she had not left so early, she would he met him.

If it snowed tomorrow, we would make a snowman.

If they won the lottery, they would trel around the world.