HSK 4
是否
shìfǒu
if, whether
Structure
Subject + (Verb) + 是否 + [Action/Quality]
How it works
The word '是否' is a formal synonym for '是不是' and translates to 'whether' or 'if'. It is used to present a choice between two possibilities (yes or no) and often functions as the object of verbs like 'knowing', 'wondering', or 'considering'.
Examples
请检查一下窗户是否关好了。
Qǐng jiǎnchá yīxià chuānghu zhìfǒu guānhǎo le.
Please check whether the windows are closed properly.
我们还没决定是否去旅行。
Wǒmen hái méi juédìng shìfǒu qù lǚxíng.
We haven't decided whether to go traveling yet.
你应当考虑他是否适合这个工作。
Nǐ yīngdāng kǎolǜ tā shìfǒu shìhé zhège gōngzuò.
You should consider whether he is suitable for this job.
Common mistakes
Using '是否' and '是不是' together in the same clause; '是否' already contains the 'yes/no' meaning.
Tip
In formal writing or professional speeches, use '是否' instead of '是不是' or the 'Verb-不-Verb' pattern to sound more sophisticated.
More HSK 4 grammar
See 是否 in real Chinese
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