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Dear Teachers,

1) I know I was wrong that I didn’t inform her about this in advance.

2) I told them that “all of you celebrate this trip, not me. So remember to explain clearly to your parents before you go to ”.

3) During the trip I also paid much attention to let nothing bad happen to them.

4) Anyway things have happened , I will sustain any discipline/ punishment that you give to me.

I will sustain any discipline/ punishment from the school/ from you.

5) I have recognized my fault, but if you are broad-minded / high-minded to forgive me, I promise to never let this happen again.

- Are these natural to say?

Thanks a lot.

Namnga.
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Could you try to clear out the miscellaneous characters in your postings before you post, Namnga? They make your posts difficult to read. After you write the post, click on Preview to check how it will look, then Edit. Thanks.
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Namnga,

Here a few possible revisions for a more natural sound:

1) I know I was wrong that I didn’t inform her about this in advance.

I know I was wrong not to have informed her in advance about this.

2) I told them that “all of you celebrate this trip, not me. So remember to explain clearly to your parents before you go to Dallas".

??? (I don't understand the context for this one. 'Explain' what to the parents?)

3) During the trip I also paid much attention to let nothing bad happen to them.

During the trip I paid close attention to everything so that nothing bad would happen to them.

4) Anyway things have happened , I will sustain any discipline/ punishment that you give to me. will sustain any discipline/ punishment from the school/ from you.

Yet certain unfortunate things did occur, and I am prepared to accept any disciplinary action you feel is appropriate.

5) I have recognized my fault, but if you are broad-minded / high-minded to forgive me, I promise to never let this happen again.

I recognize my failure. If you can forgive me, I promise never to let this kind of thing happen again.