oblige
单词辨析：
指因法律、义务、形势等关系而不得不做某事，通常用被动语态。
He was obliged to tell the truth.
他被迫讲出了实情。
Poverty obliged her to live a hard life.
贫困迫使她过艰苦的生活。
The law obliges parents to send their children to school.
法律强制父母送子女入学。
指客观情况迫使某人做某事，侧重于客观上的“必须”。
Did she have to pay a fine?
她非得交罚款吗？
I have to admit that the idea of marriage scares me.
我不得不承认，一想到结婚我就害怕。
指因需要、命令或强制而必得做某事，侧重于主观上的“必须”。
We must take action at once.
我们必须立即采取行动。
I think we must reduce our prices or spend more money on advertising.
我认为我们必须降低价格，或者是在广告上花更多的钱。
相关例句：
I would be obliged if you could read it to us.
您若能把它读给大家听，我将不胜感激。
The school regulations oblige us to be present at school on time.
校规要求我们必须按时到校。
Could you oblige us by playing a tune?
请你弹一个曲子，让我们领教一下。
I'd like to oblige you but I only have but three pictures left.
不是我不愿意为你效劳，实在是底片只剩三张了。
Mr Oakley always has been ready to oblige journalists with information.
奥克利先生总是乐于向记者透露消息。
Please oblige me with a reply as soon as possible.
请尽早给予答复。