否则
fǒu zé
if not, otherwise, else, or else
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除非我做完作业，否则不能玩游戏。
chú fēi wǒ zuò wán zuò yè， fǒu zé bù néng wán yóu xì。
Can't play games unless I do my homework.
除非明天下雨，否则我们会去公园。
chú fēi míng tiān xià yǔ， fǒu zé wǒ men huì qù gōng yuán。
Unless it rains tomorrow, we will go to the park.
请遵守规则
qǐng zūn shǒu guī zé
Please follow the rules.
今天是否下雨？
jīn tiān shì fǒu xià yǔ？
Is it raining today?
能否再说一遍
néng fǒu zài shuō yī biàn
"Can [you] again say one time?"
能否用英文说
néng fǒu yòng Yīng wén shuō
Can/May use English speak?
你是否会说汉语？
nǐ shì fǒu huì shuō Hàn yǔ？
Do you speak Chinese?
你应该尊重规则
nǐ yīng gāi zūn zhòng guī zé
You should respect rules.
你必须尊重规则
nǐ bì xū zūn zhòng guī zé
You must respect rules.
请遵守交通规则
qǐng zūn shǒu jiāo tōng guī zé
Please obey traffic rules.