1. must和have to
这两个词均表示“必须”，must常偏重主观意志，而have to偏重客观需要。must一般只用于一般现在时和将来时态，而have to则有更多的时态。例如：
We must get up at six o’clock every day. 我们每天必须六点钟起床。
It is no time, we have to get up in a hurry. 没有时间了，我们必须快点起床。
We must follow the Party forever. 我们必须永远跟着党走。
He said he would have to go with her the next day. 他说他第二天得和她一道去。
