-(으)ㄹ 텐데 vs -(으)ㄹ 테니까

Intermediate · TOPIK II

Both contain the speaker's confident guess (-(으)ㄹ 터). -(으)ㄹ 텐데 sets a guess as background, often with worry or regret; -(으)ㄹ 테니까 uses a guess or the speaker's own intention as the reason for a suggestion or command.

-(으)ㄹ 텐데An expression used to indicate the speaker's strong guess about the preceding statement and add the relevant content.-(으)ㄹ 테니까An expression used to indicate the speaker's intention to do the act mentioned in the preceding statement, as a condition for the following statement.

Rules of thumb

Showing concern for the listener ('you must be tired, so…'): -(으)ㄹ 텐데 (피곤할 텐데 좀 쉬세요).
The speaker's own intention as a condition: only -(으)ㄹ 테니까 (제가 청소할 테니까 요리해 주세요 'I'll clean, so you cook').
A guess as the reason for advice: both work (길이 막힐 테니까/텐데 지하철을 타세요 'Traffic will be bad, so take the subway').
Sentence-final -(으)ㄹ 텐데(요) expresses regret or wishing (시간이 있으면 좋을 텐데 'It'd be nice if I had time').
-(으)ㄹ 테니까 doesn't end a sentence on its own the way -(으)ㄹ 텐데 does.

Example sentences

-(으)ㄹ 텐데
You must be exhausted — get some rest early tonight.
-(으)ㄹ 테니까
I'll do the cleaning, so you do the cooking.
-(으)ㄹ 테니까
It's rush hour, so the roads will be jammed — take the subway.
-(으)ㄹ 텐데
I wish I had lots of money.
-(으)ㄹ 텐데
If you'd come earlier, you would have met them — what a shame.

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