shì
fǒu
1
whether (or not)
2
if
3
is or isn't
是否承认你犯错了?
Do you admit that you made a mistake or not?
老师在问我们是否完全明白她说的话。
The teacher is asking us whether or not we fully understand what she said.
你们是否准备好明天的比赛?
Are you ready for tomorrow's game or not?
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