是不是

nǐ shì bù shì gāi kāi shǐ yǎn xì le

你是不是该开始演戏了？

Isn't it time when you started acting?

yín háng yè zài rì běn shì bù shì wán dàn le

银行业在日本是不是完蛋了？

Is banking over in Japan?