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For example, テレビをみませ is "I will watch TV". I would like to say なにをテレビをみますか but
I'm not sure the double を makes any sense, for example in なにをみますか the person
may answer テレビ but I want to know what is on the TV that they watch?

EX2:

> としょかんでほんをよみませ  
>  I will read book/s in the library.  
>  なにをほんをよみますか  
>  What book/s will you read?

EDIT: Note that I am not looking for an adjective answer like good, scary,
fantasy, but the specific name of the book/show.
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2018-06-03T15:42:00.867
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2018-06-04T09:16:37.167
2018-06-04T09:16:37.167
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question
grammar particles
How do I ask about the specifics of a general activity (like watching TV, reading) with correct grammar?
First of all it should be テレビをみま **す**. You did this twice, so I'm assuming it
wasn't a typo.

You wrote:

> なにをテレビ **を** みますか

You're intuition is correct that you cannot use を twice. For this you use the
particle で, which means 'on' in this context:

> 何{なに}をテレビ **で** 見{み}ますか。

Using を doesn't make sense because you are not watching the TV, you're
watching a programme **on** TV. Using を with なに is correct because the answer
to the 'what' question is the thing that will be watched.

In your second example you wrote:

> なに **を** ほんをよみますか

Both 'what' and 'book' are valid objects on their own ("What will you
read?"/"Will you read a book?"), but not together. The sentence "What book
will you read?" has a single object which is "what book". In this case you can
say something like:

> 何{なん}の本{ほん}を読{よ}みますか。

Aside:

If you did want to ask "What **kind of** book will you read?" as in
scary/fantasy etc., It would be:

> どんな本を読みますか。
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2018-06-03T16:36:52.280
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2018-06-03T16:53:29.710
2018-06-03T16:53:29.710
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answer