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According to [Essential Japanese Grammar by Masahiro Tanimori and Eriko Sato
(page
352)](https://books.google.com.mx/books/about/Essential_Japanese_Grammar.html?id=CUXRAgAAQBAJ&printsec=frontcover&source=kp_read_button&hl=en&redir_esc=y),
we can pair adjectives in the ta-form with 時 to form a temporal adverbial
clause. Strangely, the book doesn't provide an example using an adjective in
the ta-form, only when it's in its dictionary form.

> 暑い時はビールがうまい.

Book 時 section from page 351 to 353:

  * [PAGE 351](https://imgurupload.org/files/Studio-20210908-010549.jpg)
  * [PAGE 352](https://imgurupload.org/files/Studio-20210908-012712.jpg)
  * [PAGE 353](https://imgurupload.org/files/Studio-20210908-010728.jpg)

From [Complete Japanese Grammar (page 156) by Eriko
Sato](https://rads.stackoverflow.com/amzn/click/com/B00JQJ1O88), we only have:

> 暑いときはエアコンをつけます。

* * *

If `嬉しいとき、悲しいとき、楽しいとき、怒ったとき、私はいつも泣きました。` translates into `When I was happy,
sad, delighted, angry, I always cried.`, why bother to conjugate each
adjective into its ta-form?

While browsing the internet for answers, I have come across the following:

> The tense of adjective sentences and noun sentences which modify とき is not
> affected by the tense of the main sentence.

Recovered from [Learn Japanese Adventure](https://www.learn-japanese-
adventure.com/toki-in-japanese.html)

Other sites such as [JLPT先生](https://jlptsensei.com/learn-japanese-
grammar/%E6%99%82-%E3%81%A8%E3%81%8D-toki-meaning/) only seem to consider the
construction: `い-adjective + とき`

I can't think of a situation where an adjective in the ta-form has a role in
the temporality of the sentence.
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grammar tense i-adjectives time
Is it not needed to use an adjective in the ta-form when paired with 時 as a temporal adverbial clause?
AFAIK, there is no real difference between adjectives and verbs in terms of
when to use their past-tense or non-past forms with 時. Both forms are valid
and useful, but they do not mean the same thing.

I think the trick here is to understand that there's nothing really special
(grammatically) about the 時 constructs: 時 is just a noun, which means "(a/the)
time(s)". If you put a verb/adjective/clause/etc in front of it, that just
modifies the noun 時 to be more specific about _which_ time(s) (i.e. the
specific point(s) in time) you are referring to, so you can just think of this
general construct as saying "the time(s) when (verb/adjective/etc is/was/will
be true)". So:

  * 暑いとき -- "the time(s) when (it) is hot" --> "at hot times", etc.

When the modifying clause is in the past tense, that actually says that _at
the point in time we are talking about_ , that action/event/condition/etc had
already happened, so:

  * 暑かったとき -- "the time(s) when (it) had been hot (previously)"

On page 353 of your book, there is actually an example (with する instead of an
adjective) which demonstrates this fairly well, I think:

> 食事をする時は「いただきます」、した時には「ごちそうさま」と言います。

This actually uses 時 twice, and if you'll note, one of them is using non-past
tense (食事をする時), but the other is using past tense (した時). Why? Because in the
first case, it is saying "at time(s) when we _will_ (are about to) eat" (at
the time we're talking about, the action hasn't happened yet, hence
present/future tense), and the second one is saying "at time(s) when we _have
eaten_ " (at the time we're talking about, the action has already been
completed, hence past tense).

As you might be able to guess, talking about "the time after some adjective
had previously been true" isn't usually as common a sort of thing to be trying
to say (compared to saying "the time after some event happened", etc), which
is why the past-tense form with 時 isn't used as often with adjectives as with
verbs, I think. However, the intrinsic meaning is still basically the same in
both cases. It just depends on whether we're saying the adjective/verb is/was
the case _at that specific time_ , or it had been the case _previous to that
time_.
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The following is my intuition.

The pattern is Aとき, B, where A is an adjective.

(1) If you mean _Whenever A, B_ , then both A and B are in dictionary form.

  * 暑い時はビールがおいしい Whenever it is hot, beer tastes good.

In this case 暑かったとき is not possible.

(2) If you mean an event in the past as _When A, B happened_ , then B is in
ta-form and A can be either in ta-form or in dictionary form.

  * 若い時アメリカに行った
  * 若かった時アメリカに行った

There may be subtle difference, but they both mean _When I was young, I went
to US._ (The latter sounds suggesting more strongly that the speaker is no
longer young.)

* * *

**FYI** Note if A is a verb, then there is a distinct difference depending on
ta- or dictionary form of A in the second case. (or so it seems to me).

  * 本屋に行くとお金を使いすぎてしまう Whenever I go to a bookstore, I spend too much money.

As for a past event,

  * 本屋に行ったときXさんに会った When I went to a bookstore, I met X.
  * 本屋に行くときXさんに会った When I **was about to go** (or **was on the way** ) to a bookstore , I met X.

Here た indicates an aspect of completion. Because of this difference, one or
the other may be more suitable depending on what B describes.
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Doing some research, I've gathered the following:

> When the predicate in an adverbial clause is stative in nature, its form
> does not change, regardless of the form in the main clause.
>
> 寒い{さむ}時{とき}、コートを着{き}ます。
```

>      "I wear a coat when it's cold."
>  
```

>
> 寒い{さむ}時{とき}、コートを着{き}ました。
```

>      "I wore a coat when it was cold."
>  
```

[Japanese Stage-Step Course: Grammar Textbook: Grammar-
Reference](https://books.google.com.mx/books?id=mW0dAAAAQBAJ&pg=PA236&dq=%E3%81%A8%E3%81%8D%20grammar&hl=en&sa=X&ved=2ahUKEwiG6qn0uPLyAhXQRjABHQw7DuMQ6AF6BAgJEAM#v=onepage&q=%E3%81%A8%E3%81%8D%20grammar&f=false)
by [Wako Tawa](https://www.amherst.edu/people/facstaff/wtawa)

* * *

> In some cases (mostly with stative predicates and adjectives), however,
> **-ta** in **toki** clauses can simply indicate past time, just as in
> English.
>
> (f) 日本に住んでいる時は、毎日日本語を使いました。
>
> **Nihon ni sunde iru toki wa, mainichi Nihongo wo tsukaimashita.**
```

>      When I lived in japan, I used Japanese every day.
>  
```

>
> (g) 日本に住んでいた時は、毎日日本語を使いました。
>
> **Nihon ni sunde iru toki wa, mainichi Nihongo wo tsukaimashita.**
```

>      When I lived in japan, I used Japanese every day.
>  
```

[Modern Japanese Grammar: A Practical
Guide](https://books.google.com.mx/books?id=qcdBDgAAQBAJ&pg=PT323&dq=%E3%81%A8%E3%81%8D%20used%20with%20stative%20adjectives%20japanese%20grammar&hl=en&sa=X&ved=2ahUKEwiS6MaXuvLyAhXCQTABHQbYCB8Q6AF6BAgHEAM#v=onepage&q=%E3%81%A8%E3%81%8D%20used%20with%20stative%20adjectives%20japanese%20grammar&f=false)
by [M. Endo Hudson](https://lilac.msu.edu/mutsuko-endo-hudson/) and [Fumiko
Nazikian](http://ealac.columbia.edu/fumiko-nazikian/)

* * *

> It is not necessary to use the past tense when pairing 時 with nouns,
> adjectives, and verbal expressions which express a state such as ある, いる,
> ~ている, or ~ない.

[Nakama 2,
Enhanced](https://books.google.com.mx/books?id=4sGTAwAAQBAJ&pg=PA89&dq=%E6%99%82%20adjectives&hl=en&sa=X&ved=2ahUKEwjnjcmzvPLyAhUeQTABHZeICB0Q6AF6BAgKEAM#v=onepage&q=%E6%99%82%20adjectives&f=false)
by [Yukiko Abe Hatasa](https://bookshop.org/contributors/yukiko-abe-hatasa),
[Kazumi Hatasa](https://www.aatj.org/election/2019/kazumi-
hatasa#:%7E:text=Kazumi%20Hatasa%20is%20a%20professor,D.) and [Seiichi
Makino](https://eas.princeton.edu/people/seiichi-makino)
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