I swore to share your joy and your pain, and I swear it all over again.

我发誓愿与你分享一切喜悦与伤悲，我将爱你此生不渝。

youdao

See, I stopped at the red traffic light, and I swear it never turned green!

红灯亮了，我踩了脚刹车，谁知道那灯再没变绿过。

youdao

Has a very subtle scent which doesn't aggravate my sensitive eyes. And I swear it is actually reducing the fine lines, which I didn't expect it to do in the first place.

它淡淡的味道也会刺激到我敏感的眼睛，我发誓它的的确确减少了我的细纹，虽然一开始我并没有抱有希望。

youdao

And, I swear, it really contains Fresca.

我发誓，这里边装的真的是斯卡。

麻省理工公开课 - 固态化学导论课程节选

And to America, I say to it and to its people this: I swear by God the Great, America will never dream nor those who live in America will never taste security and safety unless we feel security and safety in our land and in Palestine.

CNN: Bin Laden: America 'filled with fear'

Three seem to be Caucasian, one is African-American, and one appears to be of South Asian ethnicity (I would swear it is Aasif Mandvi of the Daily Show, you tell me).

FORBES: SEC Commissioner Aguilar Calls for More Boardroom Diversity

So that's what I made my name over to be, and it was fine until my classmates learned to read and swear.

NPR: From Pho to Fast Food, an Immigrant's Tale