Q: my justification を使った例文を教えて下さい。
A: That's my justification for doing what I did.
I think my justification for taking that job was flawed.
Do you want to know what my justification was?
She asked me what my justification was, but didn't like my answer.
If you think my justification is wrong, then just say so.
Hmm, my justification is better than your's!
I'm a little embarrassed that I tried to base my justification on that.


Q: justification と pretext はどう違いますか?
Pretext is more of an excuse, or a reason one gives when trying to justify something that is not true. whereas
justification is when you prove something true or reasonable.
"There was no justification for the crime she committed"
"Proving the man guilty was a hard task because there was no justification supporting his alleged faults"
"Under the pretex that he had been attacked first, the man pleaded innocent"


Q: justification d'une décision は 英語 (アメリカ) で何と言いますか?
A: It’s very similar to French. (The/a) justification for (the/a) decision. Or maybe the “the rationale for a decision”.

If you have more context it would be easier to make sure the translation sounds natural.
Q: justification は 英語 (イギリス) で何と言いますか?
A: QAの全文をご確認ください
Q: justification は 英語 (アメリカ) で何と言いますか?
A: QAの全文をご確認ください


Q: Your justification doesn't make your behavior is right. この表現は自然ですか?
A: the sentence doesnt make sense you should say; ​‎"Your justification doesn't mean your behavior is right" or "​‎Your justification doesn't make your behavior right". hope that helps!
Q: 1. There's no justification for your doing.
2. There's no justification for your having done.

Are these natural?
Or do these make no sense?
A: 1. is about something you are doing right now, while 3. can mean something that you do in general (like a job, or something you do regularly).

2 and 4 are similar, though 4 is usually used for a specific past action, while 2 can be specific or about general past actions

Hope this helps :)
Q: 1. He always tries to make justifications for his actions.
2. He always tries to make justification for his action.

Are these natural?
And which do you personally use?

A: Yes because when you say "always" it's usually used with plural.