Wǒ yīnɡɡāi chūfā le.
我应该出发了。
I should be on my way now.
Notes:
我(wǒ): I
应该(yīnɡɡāi): should
出发(chūfā): to set out
了(le): particle word
Example:
A:我应该出发了
Wǒ yīnɡɡāi chūfā le.
I should be on my way now.
B:好,再见。
Hǎo,zàijiàn.
OK, see you.