Chinese phrase
别以为我不知道 bié yǐ wéi wǒ bù zhī dào
Meaning
Don't think I don't know
When to use it
Says the speaker knows about something someone tried to hide. It often has a teasing or mildly challenging tone and points out that a secret has not stayed hidden.
Example dialogue
你 别以为我不知道，你们在背后准备了惊喜派对吧？ nǐ bié yǐ wéi wǒ bù zhī dào nǐ men zài bèi hòu zhǔn bèi le jīng xǐ pài duì ba
Don't think I don't know. You have been secretly preparing a surprise party, right?
哈哈，被你看穿了，别说出去哦。 hā hā bèi nǐ kàn chuān le bié shuō chū qù ó
Haha, you figured it out. Don't tell anyone.