연락하다([yeon-rak-ha-da/contact]) means to contact or get in touch. In polite speech, say 연락해요([yeon-ra-kae-yo]).
연락했어요([yeon-ra-kae-sseo-yo/contacted]) is the polite past form. Example: 친구한테 연락했어요 (I contacted my friend).
연락해야 해요([yeon-ra-kae-ya hae-yo/have to contact]) means you must contact. Example: 지금 연락해야 해요 (I have to contact now).
연락하다([yeon-rak-ha-da/contact]) means "to contact". It is used when you get in touch with someone by phone or message.
1. Daily: “친구한테 연락해요 (chin-gu-han-te yeon-ra-kae-yo)”
2. Past: 연락했어요([yeon-ra-kae-sseo-yo/contacted]) contacted.
3. Duty: 연락해야 해요([yeon-ra-kae-ya hae-yo/have to contact]) have to contact.
4. Warning: 연락하지 마세요([yeon-ra-ka-ji ma-se-yo/don't contact]) don't contact.
A: Who do you contact?
B: 친구한테 연락해요. B: chin-gu-han-te yeon-ra-kae-yo.B: I contact my friend.
A: 왜 연락해요? A: wae yeon-ra-kae-yo?A: Why do you contact?
B: 약속 때문에 연락해요. B: yak-so-k ttae-mu-ne yeon-ra-kae-yo.B: I contact because of an appointment. - 연락하다([yeon-rak-ha-da/contact])
A: Did you contact yesterday?
B: 네, 연락했어요. B: ne, yeon-ra-kae-sseo-yo.B: Yes, I contacted.
A: 누구한테 연락했어요? A: nu-gu-han-te yeon-ra-kae-sseo-yo?A: Who did you contact?
B: 친구한테 연락했어요. B: chin-gu-han-te yeon-ra-kae-sseo-yo.B: I contacted my friend. - 연락했어요([yeon-ra-kae-sseo-yo/contacted])
A: When do you have to contact?
B: 지금 연락해야 해요. B: ji-geum yeon-ra-kae-ya hae-yo.B: I have to contact now.
A: 누구한테 연락해야 해요? A: nu-gu-han-te yeon-ra-kae-ya hae-yo?A: Who do you have to contact?
B: 회사에 연락해야 해요. B: hoe-sa-e yeon-ra-kae-ya hae-yo.B: I have to contact the company. - 연락해야 해요([yeon-ra-kae-ya hae-yo/have to contact])
• 연락하다([yeon-rak-ha-da/contact]) contact
- 연락했어요([yeon-ra-kae-sseo-yo/contacted]) contacted
- 연락하고 싶어요([yeon-ra-ka-go si-peo-yo/want to contact]) want to contact
- 연락해야 해요([yeon-ra-kae-ya hae-yo/have to contact]) have to contact
- 연락하지 마세요([yeon-ra-ka-ji ma-se-yo/don't contact]) don't contact