是否
Meaning
- whether (or not)
- if
- is or isn't
Example sentence
他问我是否很忙。
He asked me if I was busy.
Characters in 是否
- 是 shì to be (followed by substantives only)
- 否 fǒu no, not; whether or not
是 to be plus 否, no. Affirmative and negative bound together make the question — the written counterpart of 是不是.