时间不早了，我们快出发吧！

Shíjiān bù zǎo le, wǒmen kuài chūfā ba!

It's not early, let's go!

我们明天打算早上八点出发。

Wǒmen míngtiān dǎsuàn zǎoshang bā diǎn chūfā.

We plan to head out tomorrow at 8 in the morning.

我们七点从学校出发。

Wǒmen qī diǎn cóng xuéxiào chūfā.

We will set off from school at seven o'clock.