是否 (shì fǒu) – whether (or not), if, is or isn't

Individual characters

你知道他是否来吗？

nǐ zhīdào tā shìfǒu lái ma ？

Do you know whether he is coming?

我想知道这个问题的答案是否正确。

wǒxiǎng zhīdào zhègè wèntí de dáàn shìfǒu zhèngquè 。

I want to know whether the answer to this question is correct.

请告诉我你是否愿意参加这个活动。

qǐng gàosù wǒ nǐ shìfǒu yuànyì cānjiā zhègè huódòng 。

Please tell me whether you are willing to participate in this event.

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