I was studying about とき. I came to know that とき means "when" If used in
following sentences:

Format: S1ときS2 (as per my own inference) (Please correct me if I am wrong)

>   1. S1- Adj(both i and na) and S2-Anything
>
>   2. S1 - Noun and S2-Anything
>
>   3. When S1 expresses a state and S2 anything
>
>   4. When S1 is a verb but is in ている form
>
>

Then I came across a concept, that when S1 is a verb (for now let us take
action verb), the meaning will be different as per the tenses used:

Eg.

> 私はご飯を食べるとき手を洗う （I wash my hands before I eat)
>
> 私はご飯を食べたとき手を洗う （I wash my hands after I eaten)
>
> 私はご飯を食べるとき手を洗った （I washed my hands before I ate)
>
> 私はご飯を食べたとき手を洗った （I washed my hands after I ate)

After this I came across a sentence:

> 松本さんは朝ごはんを食べるときいつもテレビを見る

In this sentence the translation in the same book was given "Mr. Matsumoto
always watches TV when he eats"

So, my queries are the following:

  1. Does this sentence (Matsumoto sentence) mean, Matsumoto always watch TV before he eats?
  2. If the sentence means what the book says i.e. "Mr. Matsumoto always watches TV when he eats" wasn't ている supposed to be used to make mean (when it was happening) i.e. 食べている rather than 食べる?
  3. Has, いつも something to do with the sentence making it a "state of being" thereby, allowing the use of "when"?
  4. Does this S1 Verb (action) condition i.e. right before or right after apply in case S2 is adjective/noun; E.g. 私は本を読むとき静かな (thereby, meaning I am quiet before I study?); 私は本を読んだとき静かな (I am quiet after I study (As in context of I am in state of silence after I study); and 私は本を読読んでいるとき静かな(meaning I am quiet when I am studying)? or is there any other rule?

Thanks :)

Book reference: A dictionary of basic Japanese Grammar Pg. 490-492
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meaning grammar comparative-constructions
Construction and Meaning of とき in the following cases
Some general thoughts on the difference between 食べるとき and 食べているとき.  
Your sentence is:

> 松本さんは朝ごはんを食べるときいつもテレビを見る。  
>  _Mr. Matsumoto always watches TV when he eats._

This is correct because there is a subtle difference between 食べるとき and
食べているとき. In the former, 食べるとき is used to describe habitual actions in a
general way. In other words, it is describing Mr. Matsumoto's general habit of
what he does while he has breakfast. The length of time of 食べるとき in this case
is the duration of his meal. What is being expressed is what happens over the
course of that duration of time.

The latter, 食べているとき is generally used to emphasise a specific instance of what
he did/does/will do while he eats his breakfast. It is more to do with the
action of eating itself rather than the abstract concept of the duration of
the meal. Think of it as if we are discussing a particular moment in time,
rather than a typical everyday occurrence. In this case, the moment in time is
the action of eating. It defines a narrower range of time than 食べるとき.

Having said that, because of the insertion of いつも, the sentence would make
sense in either case, in my opinion. Adding いつも guarantees that the listener
is aware that we are talking about habitual actions rather than an isolated
instance of something. I do think that 食べるとき is still more natural because it
refers to the general duration of the meal. And I think it is better to
remember that using plain form verbs with とき can describe habitual actions,
whereas using ～ているとき generally points to an individual momentary instance of
that action.
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Disclaimer: I am still fairly new to Japanese myself. You may want to take
this with a grain of salt, but it seems to work for me.

I think part of the problem is you're reading a bit too much into とき in those
verb examples. For me, I think it's easier to understand everything if we
consistently translate とき as "when" in all cases, and just look at the verb
tenses like so:

> 私はご飯を食べるとき手を洗う -- I wash my hands when I eat

This does not actually explicitly say "before", however it basically says that
eating and washing hands are part of the same event, and since the normal
order for someone to do that is to wash their hands first and then eat, that's
the natural implication here (the English phrase implies pretty much the same
thing).

> 私はご飯を食べたとき手を洗う -- I wash my hands when I have (already) eaten

Since the eating is past tense, this implies the associated "when" is actually
a point in time after the eating has concluded.

> 私はご飯を食べるとき手を洗った -- I washed my hands when I ate

This is just the past form of the first sentence, with the same implications
about timing, just in the past. (As is common in Japanese, the main verb being
past-tense automatically pushes any linked verbs into the past, but the non-
past-plus-とき construction still implies the two things were happening as part
of the same event, whenever that was)

> 私はご飯を食べたとき手を洗った -- I washed my hands when I had eaten

As with #2, the past tense of "eat" implies that it was concluded before the
"when" happened, so that combined with 洗った pushing things into the past as
well, we end up with a past-past tense, or in English, the past-perfect "had
eaten".

So, given this way of reading とき, then, your last sentence would actually be
read exactly as your original translation suggests:

> 松本さんは朝ごはんを食べるときいつもテレビを見る -- Regarding Mr. Matsumoto, he always watches TV
> when he eats breakfast.

The difference in interpretation here is not a difference in the meaning of とき
(it means the same "when" in both cases), but rather an implied difference in
what it means to "wash one's hands when one eats" vs "watch TV when one eats".
In the first case, people do not normally expect you to be actually washing
your hands and shoving food in your mouth simultaneously, but rather everyone
expects the conventional order of washing-then-eating, even though the text
doesn't explicitly say it. In the second case, there's no such common
assumption, and in fact most people would assume that if someone's watching TV
"when" something else is going on, that it actually means they're happening at
the same time.

On the other hand, I would tend to translate the ている form as:

> 食べているときテレビを見る -- he watches TV when he (happens to be) eating

Just as in English, this means something more or less the same as the other
(especially if combined with いつも), but just with slightly different nuances.
In English, the "when he is eating" form as opposed to "when he eats" tends to
imply a bit more that it's a condition that just happened, rather than
something that was intended/planned, and I think there's some of this in the
Japanese as well. That is, more a sense of "whenever he's eating, he seems to
find himself watching TV", as opposed to "When he sits down to eat, he also
decides to watch TV".
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松本さんは朝ごはんを食べるときいつもテレビを見る。 Mr. Matumoto always watches TV while he eats
breakfast. 朝ごはんを食べながらいつもテレビを見る、朝ごはんを食べている時いつもテレビを見る。Are Also the same meaning.
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