是不是 shìbùshìshìbúshìshìbushì HSK1 is or isn't Definitions Defs Origin Strokes Stroke Words Sentences Sents Showing: whether or not All meanings 12 shìbùshì 7 is or isn't 6whether or not 1shìbúshì 4 is it true that 4shìbushì 1 is it (or not) 1 1 sentence for 是不是 (shìbùshì — whether or not) 我不知道他是不是已经回家了。 wǒ bù zhīdào tā shìbùshì yǐjīng huíjiā le. I don't know if he has already gone home. Source: Dong Chinese Dictionary