Not at all.

没什么。

I don't know what to say. I'd like to replace it.

我不知说什么好。我赔一个新的给你。

I've bee invited over to a friend's, and you?

有个朋友请我去作客，你呢？

I will if I can.

如果我能，我愿意的。

I was wondering if you'd let me stay with you for a few days.

不知道你能否让我在你这里住几天。

United's Flight 102 leaves at 9:20.

联合公司的102次班机9点20分起飞。