-(으)ㄹ 터, (bound noun 터)
-(으)ㄹ 터이다 (predicative case particle 이다)
-(으)ㄹ 터인데 (connective ending -ㄴ데)
-(으)ㄹ 텐데 (contration of 터인데)
The bound noun, 터 is used when describing the speaker's supposition, or expectation, or volition in the form of "-(으)ㄹ 터". It is very similar to "-(으)ㄹ 것/거". It is used
나는 집에 갈 테야. I will go.home.
나는 집에 갈 거야. I will go home.
The expression '-(으)ㄹ 텐데' is used when expressing the speaker's opinion/speculation.
좋을 텐데, it would be nice
좋았을 텐데, it would have been nice