Subject + 开玩笑
开玩笑 (kāi wánxiào) means "to joke," "to kid around," or "to make fun." It is a common verb-object phrase used in everyday conversation to describe humorous or teasing behavior. It can also appear in the construction 跟…开玩笑 (to joke with someone) or 别开玩笑了 (stop kidding).
别开玩笑了,这件事很严肃。
Bié kāi wánxiào le, zhè jiàn shì hěn yánsù.
Stop joking around — this is a serious matter.
他喜欢跟朋友开玩笑,但有时候分寸把握不好。
Tā xǐhuān gēn péngyǒu kāi wánxiào, dàn yǒu shíhòu fēncùn bǎwò bù hǎo.
He likes to joke around with friends, but sometimes he doesn't know where to draw the line.
我没有开玩笑,我说的都是真的。
Wǒ méiyǒu kāi wánxiào, wǒ shuō de dōu shì zhēn de.
I'm not joking — everything I said is true.