meisha2345
1. have to do sth...t + do sth …? 为什么不做某事(=Why don’t you/we do sth….?), 2、have to do sth 不得不做某事, 3、had better do sth 最好做某事2. cannot but do sth.can't choose but do sthpclle1994 的博客 ... have no choice but to do sth.(不得不做某事); cannot but do sth.=can't choose but do sth.(不得不做某事); can't help but do sth.(禁不住做某事)等.3. be obliged to do sth7) ... 把…用于… employ…in 不得不做某事 be obliged to do sth. 在…方面低劣 inferior in.4. have to do something... decideto do something 决定做某事 have to do something 不得不做某事 in order to do something 为了做某事望采纳~