现在，我想知道你是否曾经独立工作过。

Now, I'd like to know whether you've ever worked independently.

youdao

我问道你是否曾经参加国战斗。

I ask if she has ever been in combat.

youdao

你是否曾经想过人类存在多久了？

Have you ever wondered how old humans are?

youdao

Gee, have you ever wondered how they know the composition of stars that are light-years away?

嘿！你曾经是否想过,他们是怎么知道那些离我们好几光年远的,星星的位置的？

麻省理工公开课 - 固态化学导论课程节选

So, have you ever liked somebody or disliked them and not known why?

例如，你是否曾经毫无理由地,喜欢或厌恶过某个人？

耶鲁公开课 - 心理学导论课程节选