surely和sure的区别：中文含义不同、词性不同、用法不同。surely只作副词，含义为“想必”、“无疑”、“当然”；sure可作副词和形容词，含义为“的确”、“应该的”、“有把握”、“沉着自信的”。

surely作为副词，意为(对自己的话很有把握，希望他人同意)想必;用于否定句，表示难以置信;无疑;必定;当然。

例句：It's surely only a matter of time before he is found, isn't it?

找到他只是个时间问题，对不对？

Surely you don't think I was responsible for this?

你一定不会以为出了这事是我的责任吧？

He knew that under the surgeon's knife he would surely die...

他知道他必定会死在外科医生刀下。

Slowly but surely she started to fall in love with him...

虽然过程缓慢，但她无疑开始爱上他了。

He knew that if help did not arrive soon they would surely die.

他知道，如果救援不能及早赶到，他们必死无疑。

Slowly but surely she started to fall in love with him

虽然过程缓慢，但她无疑开始爱上他了。

Where eastern Germany goes the rest will surely follow.

东德怎样做，其他地方一定会效仿。

sure可作副词和形容词，意为的确;(回答他人的感谢)不用客气，应该的；有把握;一定，必定，无疑(将会得到或发生);无疑(会做或会发生);不容置疑的;沉着自信的。

例句：You don't sound very sure.

听你这口气，你自己也不大肯定。

You're always sure of a warm welcome there.

到了那里你肯定会受到热烈欢迎。

The exhibition is sure to be popular.

这一展览肯定受欢迎。

It's a sure sign of economic recovery.

这是经济复苏的确切迹象。

Did it hurt? Sure it hurt.

疼不疼？当然疼了。

That song sure as hell sounds familiar.

这首歌确实耳熟。

He'd never been in a class before and he was not even sure that he should have been teaching...

他以前从未教过课，甚至不确定自己该不该教课。

A lot of people think that it's better to pay for their education so that they can be sure of getting quality...

许多人认为最好是接受付费教育，这样能确保教学质量。