回信

我這麼遲才回信，真不好意思。

我這麼遲纔回信，真不好意思。

Excuse me for not having answered your letter sooner.

我應該回信給他嗎？

I wonder if I should answer his letter.

我是因為太忙，所以才沒有回信給你的。

I didn't answer your letter, because I was busy.

我過了這麼久才回信，真的十分不好意思。

我過了這麼久纔回信，真的十分不好意思。

I'm extremely embarrassed that it has taken so long to reply.

请快点回信。

請快點回信。

Please write back soon.