[yīng gāi]
should; ought to; must
I don't think you have changed at all! Xiao Li shouldn't have failed to recognize you.
我觉得你一点儿也没变， 小李不应该不认识你呀!
Teachers ought to be patient with students.
教师对学生应该耐心。
I ought first to have asked your consent.
我本应该首先征得你的同意。
He has worked very hard recently, so he deserves a week's holiday.
前一段他很辛苦， 现在休息一星期是应该的。
We must see what can be done.
我们应该看看有什么能做的。