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I already know that the ている expresses a state after an action ended, rather
than a continuous aspect in some verbs, but in some contexts I wonder why the
natives would opt for する instead of している.

“イライラしている” means: “someone got angry and is still angry” “someone has gotten
angry” “someone is irritated”

But if someone just says: “イライラする” what are all the meanings this sentence can
convey depending on context? Here’s how I went about it:

  * “Someone is getting angry” (hasn’t gotten angry yet, but might)
  * “Someone will get angry” (when something happens)
  * “Someone gets angry” (a habit)

Or for example in similar verbs:

へこんでしまっている  
Someone has gotten depressed

へこんでしまう  
Someone is getting depressed (has not gotten depressed yet, but fears might)  
Someone will get depressed  
Someone gets depressed

How can I express all these English tenses in natural Japanese?
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2022-06-20T00:03:20.440
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2022-06-20T13:02:44.477
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question
tense aspect
Difference between イライラする and イライラしている
Yes, all of those three are possible meanings of イライラする.

  * イライラする!  
It's irritating! / It gets on my nerves!

  * 彼の手紙を読んだら間違いなくイライラする。  
I will definitely be angry if I read his letter.

  * 母は父の顔を見るといつもイライラする。  
My mother gets irritated whenever she sees the face of my father.  
(イライラしている is also fine; see: [Habitual
aspect](https://japanese.stackexchange.com/questions/11925/habitual-aspect))

"イライラする!" is used typically when the speaker is already upset, but if I
understand correctly, English speakers don't usually say "I'm being
irritated!" when "It's irritating!" is enough, either.
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2022-06-20T01:58:50.117
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answer