Mr.Jones and his wife （are） looking at them 和Sometimes he and his wife watch televsion.区别：
Mr.Jones and his wife are looking at them 和Sometimes he and his wife watch televsion区别：为什么前面一句看要用系动词are,后一句却不用,但是我是一个人在家自学,所以对我来说理解起来比较困难!