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My question is if there is a word for "studied", or you have to do "study +
did" to say "studied". And if that applies to all other words. Like "to work"
would be 仕事はする? Does everything work with する? Or there are some words that can
be inflected without する?
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2016-02-01T02:34:13.917
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2016-02-01T15:25:56.857
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grammar conjugations
Is there a word for "studied" or I have to use 勉強はした?
For any verbs that use する, yes, that is how you indicate an action in the
past. Although you don't use は in the middle like that. It is just 勉強した。

Verbs are very regular in the Japanese language so in my opinion verbs in
Japanese are quite straightforward to learn. There are about ~100 ways you can
conjugate する but for a list of 50 most common was you can check out
[VerbSmash](http://www.verbsmash.com/rootverb/find/to%20do)

(On a side note there are rare cases where you can use は like that for
stylistic purposes, but that's a bit beyond your level this point.)
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2016-02-01T03:12:37.257
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2016-02-01T03:12:37.257
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仕事 is a noun and 仕事する is a verb. We have a lot of verbs like 仕事する where する is
placed after a noun. And した is the past form of する. In addition, there are
many verbs without する in Japanese.

"I work" is translated as "仕事する" and "仕事をする".  
And "仕事はする" means "I work" and this "は" is used for emphasis and contrast.
Same goes with 勉強する.
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2016-02-01T04:40:01.573
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