HSK 4 · adverb · Practice
是否
whether or not; is or is not
请说明是否需要帮助。
Qǐng shuōmíng shìfǒu xūyào bāngzhù.
Please say whether or not you need help.
运动前要先检查一下器材是否安全。
Yùndòng qián yào xiān jiǎnchá yíxià qìcái shìfǒu ānquán。
Before exercising, check whether the equipment is safe.