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I am bit lost by the きたんだろう in this sentence.

あれはお前が勝手にしてきたんだろう

something like you do what you want with me? I read somewhere that this きたんだろう means something like the speaker "knows" what to do. but i am totally confused.

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Context is king! I'll try to answer your question, but trying to do it without any context is a pain in the neck.

  1. だろう is the form of でしょう, which you use when speaking with a person you're familiar with and you can afford to use it.

  2. ん is a contraction of の.

These two forms original, dictionary form would be んだ, alternatively のだ or のです. でしょう (or だろう) when linked with の/ん forms sort of rhetorical question. The speaker seeks agreement, he's not really asking the question.

  1. te-form + きた indicates that an action has been taking place over some period of time.

  2. 勝手にする means "to do something selfishly".

With these 4 points in mind, I believe the right answer to your question would be something along the lines of "I guess, you've been doing that without any regard to anyone or anything, haven't you?!"

  • I am sorry. the only context i have the other girl asks something like "do you want to kiss again" and this is his answer. So it means if they do kiss this means a lot of trouble. and in that case he just wanna say she doesn't care about the consequences. だろう and ん explanation really helped me a lot. thank u. i am sorry next time i ask i'll try to give more context – lovelykotori Jul 4 '17 at 15:05
  • While ん is certainly a contraction of の. だろう is definitely not a contraction of でしょう; rather it's a change in formality/politeness, with だろう being the more familiar term and でしょう being the default level of politeness. Otherwise, great answer. – A.Ellett Jul 4 '17 at 16:59
  • @A.Ellett Yes, my bad. That's the type of shortcut my brain has taken, or takes in general, I should say. I'll edit it. – razorramon Jul 4 '17 at 22:10
  • Your interpretation of きた is the least likely the case. It's more like "did it and came back" or "did it to me". – user4092 Jul 5 '17 at 1:40

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