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N5 — outside your level filter

だから

だからdakaraN5neutral

so; that's why — draws the consequence of what was just said

明日あしたは朝あさ五時ごじに出でるんだ。だから、もう寝ねるね。

ashita wa asa goji ni deru n da. dakara, mou neru ne.

I'm leaving at five tomorrow morning. So I'm going to bed already. casual

だから、その店みせは今日きょう休やすみだって言いってるでしょ。

dakara, sono mise wa kyou yasumi datte itteru desho.

Like I said, that place is closed today. casual

All examples4

so; that's why — the conclusion that follows from what was just said

  1. 明日あしたは朝あさ五時ごじに出でるんだ。だから、もう寝ねるね。

    ashita wa asa goji ni deru n da. dakara, mou neru ne.

    I'm leaving at five tomorrow morning. So I'm going to bed already. casual

  2. この道みちは工事中こうじちゅうだ。だから、遠回とおまわりしたほうが早はやい。

    kono michi wa koujichuu da. dakara, toomawari shita hou ga hayai.

    This road is under construction. That's why going the long way round is faster. neutral

  3. 会場かいじょうの収容人数しゅうようにんずうには限かぎりがございます。ですから、お早はやめにお申もうし込こみください。

    kaijou no shuuyou ninzuu ni wa kagiri ga gozaimasu. desukara, o hayame ni omoushikomi kudasai.

    The venue's capacity is limited. For that reason, please apply early. formal

like I said — repeats the speaker's earlier words, not a new point

  1. だから、その店みせは今日きょう休やすみだって言いってるでしょ。

    dakara, sono mise wa kyou yasumi datte itteru desho.

    Like I said, that place is closed today. casual

How it's formed1

All forms1

  • ですからdesukaraformal

    the polite form — service speech and spoken announcements; same sentence-initial position, and it changes nothing but tone.

Notes

だから, aimed at the person you're answering, can sound impatient. Formal
writing uses そのため or したがって instead; ですから stays polite but spoken.