The second part of the sentence gives the speaker's advice or suggestion to the listener. The first part explains why the speaker is giving that advice or suggestion. '까' is sometimes omitted.
Example
비가올테니까우산을가져가세요.
Since it will rain, please bring an umbrella.
일찍일어날테니까늦지말고잘준비하세요.
Since you will wake up early, don't be late and prepare well.
바쁠테니까오늘은점심을밖에서먹자.
Since we'll be busy, let's eat out for lunch today.
요리는내가할테니청소기좀돌려.
I'm going to make the food, so you vacuum.
Other usages
It can also be used at the end of a sentence in the form of (으)ㄹ 테니까요.
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