I swear (that) I'll never leave you.

我保证决不离开你。

《牛津词典》

You said you would never leave.

你说过，你永远不会离开。

youdao

Now I shall never, never leave you again!

现在，我绝不，绝不再离开你！

youdao

Soon after she arrived in the United States, Alisa decided she would never leave.

VOA: special.2010.06.06

If I want to persuade you that I love you, would never leave you, you can trust me with everything, it may be a superb tactic for me to believe it.

如果我想让你相信我爱你，永远都不离开你，你什么都可以信任我，或许最好的策略便是我自己对此深信不疑。

耶鲁公开课 - 心理学导论课程节选

Never go back. Find another. Leave at once. Go for a long trip again, but this time we'll go wherever I want, won't we?" I nodded. My Lolita.

绝不会去，另找一所学校，马上走，再去长途旅行，不过这次去我想去的地方，好吗？“我点头，我的洛丽塔。

耶鲁公开课 - 1945年后的美国小说课程节选

The global popularity of ATM cards has also helped ensure people never leave home without one.

CNN: ASIANOW - Asiaweek

Never leave the house with wet hair (unless you are in college or camping).

FORBES: Superficially You: Finessing the First Impression

However one thing is for certain, the main U.K. opposition parties would never leave Europe.

FORBES: What If The U.K. Leaves Europe?