My level of Japanese is still very basic. So sorry if I what I'm saying
doesn't make sense.

As I understand it, Japanese do not like the usage of pronouns to express if a
sentence's subject or direct object is in the 1st, 2nd or 3rd person. Actually
Japanese seems to use as little pronouns as possible. But even when replacing
pronouns by people's name the subject tends to be completely dropped.

The reasoning given by _most_ learning resources online is that you should get
it from the context and that you will learn to understand if after hundred of
hours of immersion. But based on the little immersion I could do, on example
sentences from ejje.weblio and other learning resources explaining grammar
point by point, I think (hopefully I'm not completely wrong) there is more to
that. And even completely out of context, a sentence can contains enough
information to tell what the subject is without relying on pronouns.

Here's a few sentences and what, I, as a beginner listener would assume the
subject to be.

> 悲しそうだよね。

I would assume that the subject would be "you", based on the usage of "そう" and
the particule "よね".

> 悲しいの？

I would assume that the subject is "you", because it's a question.

> 悲しいよ。

I would assume that the subject is "I", because of the particle "よ"

> 悲しがってるとおもう。

I would assume that the subject is "he/she", based on the usage of the verb がる
and the ending in "とおもう"

First of all, are my assumptions correct? If I'm right, my question would be
the following:

Do you know any other example of words or expression that can help understand
if the subject is 1st, 2nd or 3rd person without using pronouns? I think I
would understand enough to read or listen to this kind of sentences, but it
would help me to express myself better if I knew all those little words and
expressions.

Edit:

I just thought of another one: ほしい is automatically "I want" and can't be use
for "you want" or "he/she wants".

Edit 2:

I replaced 怖い by 悲しい as it seems more suitable for my examples. I wanted
examples that implies that the subject is a person.

Also the end goal here is not just better understanding, because, yes context
DOES matter. The end goal here is how can I express myself better. I want to
drop the 私は あなたは 田中せんは etc. but still be able to be understood. Like when
should I use ほしい and not -たい, when should I use がる, am I clear enough or
should I add a subject for this sentence? This kind of stuff. If I understand
the implications of those little words better it would help me to know when
the topic/subject is absolutely necessary and when I can drop it.
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grammar expressions sentence-final-particles first-person-pronouns second-person-pronouns
"Strategies" to speak in 1st, 2nd or 3rd person without pronouns
It does take many hours to get used to, and it is impossible to answer it in
one answer. You are trying to simplify the problem too much. If you are
presented with a single sentence without absolutely no subject and no context,
it is not likely that you will be able to perfectly guess the subject.

Depending on the context, 「悲しそうだよね」 can be "You look sad", "He looks sad,
huh?", "This (movie) looks sad, huh?", or even "Yeah I must be looking sad to
you" in uncommon contexts. 「悲しいの?」 can be "Are you sad?", "Is she sad?", "Is
this story sad?", or even "Am I feeling sad?" in rare contexts. The rules
around 欲しい and 欲しがる are more complex than you might expect (see
[this](https://japanese.stackexchange.com/a/23861/5010)).

Among the Japanese-specific elements, keigo and [role
languages](https://anime-manga.jp/en/) are probably the most important topics
that increase the chances of omitting personal pronouns. For example, we can
at least say the subject of いらっしゃる is never "I". Unfortunately, these are
difficult. By the time you have mastered them, you probably no longer wonder
when to drop personal pronouns...
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answer