This is used to give a reason. It is like saying 'because, you know...' or 'because, see...'.
Clause + からさPrimary
This is used to give a reason. It is like saying 'because, you know...' or 'because, see...'.
明日テストがあるからさ、今夜は遊べないんだ。
I can't hang out tonight because I have a test tomorrow, you know.
なんで遅れたの？ — あ、ごめん。電車が遅れたからさ。
"Why were you late?" "Ah, sorry. It's because the train was late, you see."
ごめん、今は貸せない。本当にお金がないからさ。
Sorry, I can't lend you any right now. It's because I really don't have any money, you see.
もう帰るの？ — うん、ちょっと眠いからさ。
"You're going home already?" "Yeah, 'cause I'm a little sleepy, you know."
いいから黙ってやれ！俺がリーダーだからさ、文句言うな。
Just shut up and do it! I'm the leader, that's why, so don't complain.
Both "~から" and "~からさ" tell you a reason. "~からさ" is for casual talk only. It adds a personal feeling. It makes the reason sound like a friendly chat. "~から" is a neutral way to give a reason. "~(ん)だから" is stronger than "~からさ". "~(だ)もん" can sound childish. "~からさ" is more like stating a fact, but still very casual.
Don't use this when you need to be polite. For example, don't use it in a business email. This phrase is for talking with friends. It is for casual chats. It is not for formal writing.
Use this when you want to share a reason with a friend. It makes your reason sound friendly. It helps you agree with each other. It makes talking easy among friends.
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