既然

你nǐ既然jìrán已经yǐjīng知道zhīdào了le，还hái问wèn什么shénme？

If you already know, why are you still asking?

既然jìrán雨yǔ已经yǐjīng停tíng了le， 我们wǒmen可以kěyǐ回家huí jiā了le。

Now that it has stopped raining, we can go home.

既然jìrán你nǐ在zài这里zhèlǐ， 那nà我们wǒmen就jiù开始kāishǐ吧ba。

Since you're here, we might as well begin.

既然jìrán你们nǐmen这么zhème说shuō，那nà让ràng我wǒ再zài想想xiǎngxiang。

Since you all say that, I must think again.