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I encountered the following sentence from Jisho.org when looking up the
definition of 確かめる {たしかめる}:

> 窓｛まど｝が閉まって｛しまって｝いるか確かめとけ

As 確かめる is a transitive verb (according to Jisho.org at least), I was under
the impression that it **required** a direct object marked with を in order to
be intelligible. However, in this sentence, the direct object (at least by
English standards) seems to be marked with か. I assume this has something to
do with the fact that the object is a clause rather than a single noun.

My actual questions are:

  1. Is the above form specific to 確かめる or can it be generalized to other verbs (～ているか＋transitive verb). For example, would the following be a natural/understandable sentence?

> 本に書いているか止めなさい。
>
> Stop writing in the book.

  2. Could the か have been replaced with another particle (perhaps と or maybe even ことを) and if so, would the meaning have changed?

  3. Are there other valid particles that could mark an object of a transitive verb besides を and か?
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question
nuances particles transitivity
Transitive verbs where the direct object is a clause
"​窓​が​閉まっているか確かめとけ" = "窓​が​閉まっているかどうかを確かめとけ"

"か" of "​窓​が​閉まっているか確かめとけ" is the abbreviation of "かどうかを(whether)"

"それは本当か確かめたい" = "それは本当かどうか（本当か嘘か）を確かめたい"

* * *

本に書いているか止めなさい。is entirely wrong!

"本に書いているか" = "（誰かが）本に（何かを）書いているかどうか" = "Whether somebody writes something in
the book"

So "本に書いているか止めなさい。" sounds oddly "Stop wheter somebody writes something in the
book"

"Stop writing in the book." => "本に書くのは止めなさい" or "本に書くのを止めなさい"

ちなみに、"Stop writing in the
book."は、"本に落書きするのは止めなさい"って意味ですか？writingの目的語が何だか分かりません。
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This structure is called [embedded
questions](https://japanese.stackexchange.com/q/13034/5010).

> Is the above form specific to 確かめる?

No. It's not specific to 確かめる, but used with 聞く, 考える, 見る, 知っている, 教える, and so
on.

> For example, would the following be a natural/understandable sentence?
> 本に書いているか止めなさい。

No. Because か is the question marker, that sentence does not make sense.
"[×]Stop whether you write something on the book!"

> Could the か have been replaced with another particle (perhaps と or maybe
> even ことを) and if so, would the meaning have changed?

In this case, yes, but the meaning will change a bit.

  * 窓が閉まっているか確かめとけ。 Confirm **whether** the window is closed.
  * 窓が閉まっていると確かめとけ。 Confirm **that** the window is closed.
  * 窓が閉まっていることを確かめとけ。 Confirm **that** the window is closed.

The last two sentences strongly say the window must be closed. The first one
still usually implies the same thing, but basically only says you must check
whether the window is open or closed.

> Are there other valid particles that could mark an object of a transitive
> verb besides を and か?

As you have already said, と for quotes is a particle that works like an object
marker (e.g., ～と思う, ～と聞く). I don't know if it's grammatically an object marker
in Japanese, though.
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