过我们的话，我们现在就不会来这里了。

②从句的动作与现在事实相反，而主句的动作与过去事实不符。如：

If he were free today, we would have sent him to Beijing. 如果他今天有空的话，我们会已经派他去北京了。

If he knew her, he would have greeted her. 要是他认识她的话，他肯定会去问候她了。

③从句的动作与过去发生的情况相反，而主句的动作与现在正在发生的情况相反。如：

If it had not been raining too much, the crops would be growing much better. 如果天不下太多的雨的话，庄家会长得更好。

If he had been working hard, he would be working in the office now. 要是他工作一直努力的话，他现在已进了办公室了。

【活动】探究三 省略if的情况

Were I a boy，I would join the army.

Had he taken my advice，he would have succeeded.

Were it not for the expense，I would go to Britain.

总结归纳：有时候在使用时可省略if，句子则可换成下列形式，即"were/had/should＋主语"。

【练习】训练检测

Work with your partner and translate the following sentences.

1. 假若当时我走快点，那石头就不会砸我头上了。

2. 我要是一只小鸟，我就整天站在Jack的肩上。