Please raise your hand if you have something to say.

发言请举手。

No sleeping in class.

课上不准睡觉。

You snooze, you lose.

贪睡你就输了。

Please put your cell phones on silent mode.

请把手机调成静音模式。

Please don't talk when I'm talking.

我讲课时你们不要说话。

Let's chat about this after class together.

聊什么呢？下课了咱们一起聊。

Did you bring enough (food) for the rest of us, too?

你带的东西够请全班人吃吗？

And what was your adviser's name, again?

你的辅导员叫什么名字来着？

Could you speak louder, please? I can't hear you.

大点声，我听不清你在说什么。

Don't write anything down, yet. Just listen carefully.

别忙着记笔记，先仔细听讲。