http://keytokorean.com/classes/intermediate/intermediate-grammar-4-%EC%9C%BC%E3%84%B9-%ED%85%8C%EB%8B%88%EA%B9%8C-since-it-might-you-should/ ~(으)ㄹ 테니까: Equivalent to “since it might…” or “since he/she might…” Gives a suggestion to the listener A combination of ~(으)ㄹ 터이다 (gives an intention) and ~(으)니까 (expresses a reason) 1st clause: provides a reason for… 2nd clause: …the suggestion or advice Usage: Can also be used at the end of a sentence (~(으)ㄹ 테니까요) Only for first person subjects Only verbs can precede it, but no past tense verbs Difference: ~(으)ㄹ 텐데 = an actual situation for giving an assumption Difference: ~(으)ㄹ 테니까 = the reason for giving an assumption (future tense, assumed) Difference: 때문에 = the actual reason for something (past/present tense, actual) CANNOT be used with 걱정이다, 고맙다, 미안하다 Tenses: Adj/Verbs: 과거: ~았/었을 테니까 현제/미래: ~(으)ㄹ 테니까 Noun이다: 과거: 였을/이었을 테니까 현재/미래: 일 테니까 Examples: 과거: A: 초콜렛을 많이 먹으면 살 찔 테니까! (You might get fat if you eat lots of chocolate!) N: 장차 배우가 되려는 사람이었을 테니까 배우학교에 다녀야 했어요. (Since he’s a guy who wants to be a future actor, he ought to go to acting school.) A: 그 책상은 고장났을 테니까 깎아 주세요. (Since the desk looks like it was broken, you should give me a discount.) 현재: A: 비 올 테니까 우리 집으로 가겠습니다. (Since it looks like rain, we should go home.) A: 대통령은 바쁠 테니까 예약을 해야 해요. (Since the President might be busy, you should make a reservation.) V: 운동을 열심히 하기 때문에 피곤할 테니까 꼭 일찍 자야 해. (You’re probably tired from all the exercise, so you should go to bed early.) N: 이 것은 그 회사의 전화번호일 테니까 연락 해 주세요. (Since this is probably the company’s phone number, you should call it.)

"ㄹ 텐데" has same meaning as "ㄹ 것 같은데" "ㄹ 텐데" has stronger supposition/assumption than "ㄹ 것 같은데" When used with -면, 텐데 is more commonly used than 것 같은데. 시간이 되면 갈 텐데 If the time is right, I would go. 맛있으면 먹을 텐데 If it's delicious, (I/he/she/they) would eat. From http://keytokorean.com/classes/intermediate/intermediate-grammar-3-%EC%9C%BC%E3%84%B9-%ED%85%90%EB%8D%B0-i-would-imagine/ ~(으)ㄹ 텐데: - Equivalent to "I would imagine..." or "...must be true..." - Expresses the expected/intended future state of things - Combination of ~(으)ㄹ 터이다 (gives intention) and ~(으)ㄴ/는데 (expresses background info) - 1st clause: Strong expectation ("I would imagine...") - 2nd clause: Related or contrary statements ("so/but") Usage: - Can finish a sentence ~(으)ㄹ 텐데요 = the speaker's supposition/assumption - Difference: ~(으)ㄴ 데 = provide background info, or introduce the next topic - Difference: ~(으)ㄹ 텐데 = express supposition about a current or future situation Tenses: Adj/Verbs: 과거: ~았/었을 텐데 현재: ~(으)ㄹ 텐데 Noun이다: 과거: 였을/이었을 텐데 현재: 일 텐데 N/V + ㄹ/을 텐데(요) => "I imagine," "I would think," "it must be" This short connective form of -을/일 터인데 indicates the speaker's expectation or anticipation. It is derived from the verb 터이다 "to expect" and the connective -ㄴ/는데. (a) 동부지방에 단풍이 한창일 텐데(요). => The fall foliage must be wonderful in the East. 오늘이 동생 생일일 텐데 케이크를 먹었는지 모르겠다. => Today must be my younger sibling's birthday, but I don't know whether he/she had a cake. (b) 피곤할 텐데 자지도 않고 책을 본다. => He must be tired, but he reads on without sleeping. 날씨가 추울 텐데 반바지를 입고 돌아다닌다. => The weather should be cold, but he is walking around in shorts. 무거울 텐데 제가 좀 도와 드릴까요? (It must be heavy. So, can I help you?) 자고 있을 텐데 전화하지 맙시다. (He might be sleeping. So, let’s not call.) 이미 끝났을 텐데 가지 마. (It must ends already. So, don’t go.)

~할테니까 therefore Ex) I will do that work, (therefore) you can find another work. 내가 이 일을 할테니까 넌 다른 일을 찾아봐. It will rain today, you should take an umbrella. 비가 올테니까 우산 가지고 나가. ~텐데 It would be Ex) It would be spicy, drink some water 매울텐데 물좀 마셔 It would be nice, If you came 네가 오면 좋을텐데 There is no definitely same word in English, but it's same expression. I hope this helpful to you