今天在查看邮箱时才看到几天前客户发的邮件，由于当时忙的很，给忘记回复客户邮件了。就赶忙回复邮件，第一句当然是说“抱歉，回复得晚了！”，想都没想就写了“Sorry, repply too late!”，写完这句感觉很Chinglish啊，那到底用英语怎么说“抱歉，回复得晚了！”呢？
其实可以分正式和非正式两种情况的。我们大部分情况下是非正式的。
1.非正式写法
直接说：
I am sorry for the late reply.
I am so sorry to reply you late.
Sorry for getting back to you (so) late.
Sorry for the late reply/response.
I'm so sorry for replying your e-mail so late because of...
间接说：
I'm sorry that I couldn't write you back earlier.
Sorry for not getting back to you sooner.
2.正式说法
I appologize for the late reply.
Please excuse me for getting back to you so late.
Please forgive me for not having answered your email from Monday.
3.如果有人回复邮件对你这样说，该怎么回答呢？
其实也就是我们常说的“没关系，不用介意等等”。It’s Okay. Never mind. No worries. No problem...