swear

I swear (that) I was there. [=I was definitely there; I am telling you the truth when I say that I was there]我发誓我当时在那儿。

Her English is so good that you would swear she has been studying it for years. [=you would really think that she has been studying it for years, even though she has not]她的英语太好了，你一定以为她已经学了好多年了。

You'd swear (that) the jewels are real. [=the jewels look very real even though they are not]你一定会说这些珠宝是真的。

I didn't do anything wrong. I swear (on my mother's grave). [=I am being absolutely honest when I say that I didn't do anything wrong]我没做错任何事。我（对九泉之下的母亲）发誓。

I wouldn't swear to it [=I'm not absolutely sure about it], but I think he's written three books so far.尽管不敢绝对肯定，但我认为到现在为止他已写了三本书。

He swore [=vowed] to seek revenge.他发誓要报仇。

He swore revenge on the killers.他发誓要向那些杀人者复仇。

I swear (that) I'll never do that again.我发誓再也不干那种事了。

I swear to God, I'll kill him if he comes back.我对天起誓：他要回来我就杀了他。

I'll never do that again. Swear to God. [=I promise you that I'll never do that again]我对天起誓再也不干那种事了。

Don't swear in front of the children.别在孩子面前说脏话。

The other driver swore at me and drove away.另一个司机冲我骂了一句，然后就开车离去了。

I do solemnly swear to tell the whole truth.我郑重宣誓我讲的都是实情。

They swore (an oath of) allegiance to the United States of America. [=they formally promised that they would be loyal to the United States of America]他们宣誓效忠于美利坚合众国。

Witnesses are required to swear on the Bible [=to put a hand on the Bible and make a formal promise to tell the truth] before they testify.证人提供证词之前要手按《圣经》起誓。

He swore us to secrecy/silence. [=he made us promise not to tell anyone his secret]他要我们起誓保守秘密。

Witnesses are sworn to tell the truth.证人按照要求起誓讲真相。

I heard him say a swear.我听到他说了句脏话。