Sorry I showed up at your door. I--抱歉就这样出现在你家门前，我...

show up露脸，出现

His show-off only serves to show up his ignorance.

他的卖弄只不过暴露了他自己的无知。

What puzzles me is why they didn't show up.

令我百思不解的是他们为什么没有出现。

Look, I had a hunch you might not be coming back.我预感到你不会再来上课了

come back回来

I can come back to my hometown some day.

总有一天我会回到家乡。

I persuaded him to come back with all my might.

我竭力说服他回来。

Maybe you're not comfortable with the whole teacher-student thing.也许你不习惯这种师生之间的感情

comfortable with对 ... 感到舒服

Do your feel comfortable with the plan?

你对这个计划满意吗?

I'm pretty comfortable with the whole situation.

我已经坦然接受这个局面了。