是否

shìfǒu

adverb HSK 4 #521

Meanings

1 whether or not
2 if

Characters

no; not; whether

Yes + no = yes or no, used to ask whether something is the case.

Examples

请确认是否收到邮件。

Qǐng quèrèn shìfǒu shōu dào yóujiàn.

Please confirm whether you received the email.

我不确定他是否同意。

Wǒ bú quèdìng tā shìfǒu tóngyì.

I'm not sure whether he agrees.

是否参加由你决定。

Shìfǒu cānjiā yóu nǐ juédìng.

Whether to participate is up to you.

Tips

usage

是否 is more formal/written than 是不是 (shì bú shì). Use 是否 in formal writing and emails.

Stroke Order

是 shì

否 fǒu