For example :日本語を勉強します.

Do you pronounce ni hon go wo or ni hon go---
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2011-11-07T16:17:25.637
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particles pronunciation particle-を
How do you pronounce を after a subject?
「を」 is never used to lengthen a 「お」 sound, only 「う」 or 「ー」, and in certain
specific situations 「お」.

Having said that, the "w" sound is normally elided so that it sounds _similar_
to a long 「お」, but there is usually enough of a difference to make a
distinction.
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2011-11-07T16:39:13.130
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2011-11-07T23:51:02.870
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answer
“を” is pronounced in the same way as “お,” that is, without a consonant.
Therefore, if it is preceded by a mora with vowel /o/, it sounds in the same
way as [chōonpu](http://en.wikipedia.org/wiki/Ch%C5%8Donpu) “ー.”

Some people pronounce “を” as /wo/, but this pronunciation is nonstandard.
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2011-11-07T22:51:16.453
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日本語を勉強します

In other languages (I don't know the term for this) 語を can be transcribed as
`go'o`

There is a slight stop between both sound, almost not perceptible. In faster
speech, if no cut is perceptible, there is definitely an accentuation
difference. (or voice level)

To compare with other similar sounds:

  * おう is an uninterrupted `ooh` sound
  * おお if part of the same word, is also an uninterrupted `ooh` sound
  * ...お お... (as in 2 different words 日本語おねがい) is also a `o'o` sound
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2011-11-08T00:37:04.317
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answer
The other answers seem to have come controversy, so I'm going to propose a
different approach, which is that of a non-native learner of the language.
Native speakers will disagree about the pauses and intonations, just like
native English speakers disagree over things like
"[tomato](http://www.youtube.com/watch?v=J2oEmPP5dTM)".

The point to know, in reference to your question, is that there is no
convention or rule that makes `を` combine with a word before it.

However, when listening to native speakers talk, as a non-native, you will
_very likely not hear any distinction_ , especially if they are speaking
quickly. And, of course, any kind of distinction you might discern will vary
depending on who you listen to, so you can't expect it every time.

My recommendation to you as a learner of the language is that when you _speak_
, consciously keep `を` separate from the word before. Pause if you want, don't
if you don't want. Also, whether or not your separation of `を` from the word
before it is distinct or not will not matter too much to a listener, because
context makes it understood that it was there.

The important thing is that you know it's there. Because good grammar is not
just a good idea, it's the law.
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answer