ought to

例句：

1. 1.You ought to finish your homework before you go out tonight.
   你今晚出去之前应该完成你的家庭作业。
2. 2. We ought to be more considerate of others' feelings.
   我们应该更加体贴他人的感受。
3. 3. She ought to have known better than to trust that man.
   她本不应该相信那个人。