他既聪明又勤奋。
Tā jì cōngmíng yòu qínfèn.
He is both smart and hardworking.
她既高又瘦。
Tā jì gāo yòu shòu.
She is both tall and thin.
既然这样，我就走。
Jìrán zhèyàng, wǒ jiù zǒu.
Since that's the case, I'll leave.
既然你不去，我去。
Jìrán nǐ bù qù, wǒ qù.
Since you aren't going, I'll go.
