他总是喜欢开玩笑。
tā zǒngshì xǐhuān kāiwánxiào 。
He always likes to joke around.
不要开玩笑,事情很严重。
búyào kāiwánxiào , shìqíng hěn yánzhòng 。
Don't joke around, this is a serious matter.
我以为你在开玩笑,其实你是认真的。
wǒ yǐwéi nǐzài kāiwánxiào , qíshí nǐshì rènzhēn de 。
I thought you were joking, but you were serious.