How do I add an object to noun を します verbs?

Question

When you want to associate a noun を します action (what English-speakers would call "verbing a noun") with a specific noun, what particles are used and where?

For example, if I was saying "I study", you could say 勉強{べんきょう}をします. But if you were wanting to say what you're studying, would you move the particle を, so that it'd be 日本語を[勉強]{べんきょう}します, or would you keep the particle を, and add a の between the additional noun and the verbed noun, so that it'd be 日本語の[勉強]{べんきょう}をします?

Answer 1

As common as nounする　is, する verbs all decided. In the case of nounする it can be considered as a single word, not as 2 words.

That is to say that you can't just take any noun and add する to make it a verb, only some nouns work like this.

To be clear 勉強する is a verb on it's own.

However pretty much any word with an action/verbal component can be made into a verb by using をする. Since 日本語の勉強 is a noun, but not a noun on the list of する verbs, you must use をする.

Answer 2

勉強 is a noun and する is a verb. And 勉強する is a verb because we sometimes make verbs like 勉強する by setting する behind a noun.

日本語を勉強する=日本語+を(postpositional particle for object)+勉強する(verb)

日本語の勉強をする=日本語+の(postpositional particle which means "of")+勉強(noun)+ を(postpositional particle for object)+する(verb)

The above two sentence is natural. However 日本語を勉強をする is unnatural. How about 日本語の勉強する? I think this sentence is grammarwise incorrect but it is sometimes used colloquially. It is the one which is clipped "を".　

Answer 3

Some nouns can be transformed into verbs by adding をする.
The resulting verbs can be transitive (e.g. 勉強をする, to study) or intransitive (e.g. 旅行をする, to travel). If you specify a direct object for the resulting verb, you have to have identify it with を, so you have to remove the other を before する (because only one direct object per verb is possible).

Right:スペイン語を勉強しています
Wrong: スペイン語を勉強をしています

If you don't use direct object for the resulting verb, you can keep or drop を before する at will.

Right: 毎日勉強しています = 毎日勉強をしています
Right: 旅行したい = 旅行をしたい

Constructions like 英語の勉強をする = 英語の勉強する are grammatically correct, but rarely used.