用if so完成句子。 1. Will you be free this evening?____,let us go to the concert together. 你今晚有空吗?如果有,我们一起去听音乐会吧. 2. Is anybody feeling cold?____,let us open the windows. 有人感到冷吗?如果没有的话,我们把窗户打开. 3. — I hear Tom fell off his bike and hurt his arm. 我听说汤姆从自行车上掉下来摔伤了胳膊. — _____, let's go and see him. 如果是那样的话,我们去看看他吧. 4. Point out the mistakes in the sentences,____ . 指出句中的错误,如果有的话. 5) ____ , try to speak English as often as you can. 如果可能的话,尽可能经常地讲英语. 6. ____, I will go there myself. 如果必要的话, 我将亲自去那儿一趟.