你是否承认你犯错了？

Nǐ shìfǒu chéngrèn nǐ fàncuò le?

Do you admit that you made a mistake or not?

你们是否准备好明天的比赛？

Nǐmen shìfǒu zhǔnbèihǎo míngtiān de bǐsài?

Are you ready for tomorrow's game or not?

老师在问我们是否完全明白她说的话。

Lǎoshī zài wèn wǒmen shìfǒu wánquán míngbai tā shuō de huà.

The teacher is asking us whether or not we fully understand what she said.