是不是

Revision: I'm wondering if my boyfriend is serious about me.

我不知道我男朋友对我的感情是不是真的。

This is willcontinuing investigation ,like we said we don't know if the guy manufacture the ricin or not.

调查会一直继续，像我们所说，我们还不知道毒药是不是出自此人之手。

I don't know if I want to get decked out for the night and have to ride a bicycle in high heels.

我不知道我是不是想晚上打扮得美美的，然后穿着高跟鞋踩脚踏车出去。

I don't know whether it is a right or wrong choice.

我也不知道这是不是一个正确的选择。

I don't know if I'm doing the right thing speaking out.

我不知道我说出来是不是对的。

When, however, Ustinov is asked if he minds being saddled with the dread tag of "Renaissance Man", he is as ready as ever with a sharp riposte-"I didn't think I was as old as that!"

但是，当有人问他是不是不喜欢套上"多才多艺的人"这样一个令人敬畏的招牌时，他像往常一样立即机敏地答道："我从前可没想到自己有那么的古老。"

Are you on a riverbank with no way to get to the other side?

你是不是觉得自己身处一个到不了对岸的河堤旁？

I don't kown if professor has a roll call.

我不知道教授是不是已经点了名？

I don't konw is the professor make a roll call?

我不知道教授是不是已经点了名？

I don't known,whether rollcall the name ?

我不知道教授是不是已经点了名？

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。