Humour thy fancy, if thou must, but choose some other title.

如果你非要异想天开来找乐子的话，你得要选一个别的头衔。

youdao

He offered the prisoner a chance, saying, "If thou canst say aught in thy behalf, speak."

他给了囚犯一个机会，说：“如果你有什么想要辩护的，就说吧。”

youdao

If thou hast hid my servant, find him for me, or thou shalt sup sorrow for what thou hast done.

你若藏了我的仆人，就替我把他找来，免得你因所作的事后悔。

youdao

Or,if thou wilt not, be but sworn my love, And I'll no longer be a Capulet."

VOA: special.2010.01.06

Deny thy father and refuse they name, or if thou wilt not, be but sworn, my love, and I'll no longer be a Capulet." She's a Capulet.

否认你的父亲，抛弃你的姓名吧，也许你不愿意这样做，只要你宣誓做我的爱人，我也不愿再姓凯普莱特了，她姓凯普莱特。

麻省理工公开课 - 固态化学导论课程节选

But if thou dost, remember that thy gun had nothing to do with it.

ECONOMIST: Coming soon to America��s public schools

But they do want to understand about the depth of emotion and the nature of, of the, the sort of commitment side of sexuality and they will talk about that openly if you no longer impose upon them some kind of thou shalt never do this kind of approach.

BBC