'Sorry for replying late' and other phrases in Korean?
How would I go about saying:
1) I am sorry for replying late.
2) I had no internet/I had no Wi-fi.
3) I did not realize that you already replied
4) My school has bad internet. It did not let my messages send.

I don't know how to communicate well with my e-penpals so when they get shocked that it took me 8 or so hours to reply because my school's wifi doesn't let me access kakaotalk properly I don't know how to explain it to them. haha. But if someone could translate one or all of these it'd help out a lot! Please and thank you!

Question

'Sorry for replying late' and other phrases in Korean?
How would I go about saying:
1) I am sorry for replying late.
2) I had no internet/I had no Wi-fi.
3) I did not realize that you already replied
4) My school has bad internet. It did not let my messages send.

I don't know how to communicate well with my e-penpals so when they get shocked that it took me 8 or so hours to reply because my school's wifi doesn't let me access kakaotalk properly I don't know how to explain it to them. haha. But if someone could translate one or all of these it'd help out a lot! Please and thank you!

Answer

1) 답장이 늦어서 미안해요 
2) 인터넷 or 와이파이를 사용할 수 없었어요 
3) 당신이 답장을 벌써 보낸 줄 몰랐어요 (메세지가 온 걸 못 봤어요(or몰랐어요) is natural i think)
4) 학교 인터넷 상태가 안 좋아서, 메세지를 보낼 수 없었어요

^^

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