write one word that means the same as the phrase:

expressed his regret is the phrase but this is the whole sentence :

The father expressed his regret
for his misconduct of his son.

PLEASE HELP! I have also tried to answer nearly all your questions! I have to hand it in a few days or shall I say 1 day.

http://www.thesaurus.com/browse/rue?s=t

Which word will you choose to use?
How will you rephrase the sentence?

The word that means the same as the phrase "expressed his regret" is "apologized." In your sentence, you can replace the phrase with the word "apologized" to make it more concise and clearer:

The father apologized for his son's misconduct.

In order to find an appropriate word or phrase, you can consider using a thesaurus. A thesaurus is a reference tool that provides synonyms (words with similar meanings) and antonyms (words with opposite meanings) for a given word or phrase. You can easily find online thesauruses by searching for "online thesaurus" on a search engine.

When using a thesaurus, you can look up the word or phrase you want to replace, such as "expressed his regret." The thesaurus will then provide you with a list of alternative words or phrases that convey a similar meaning. Review the options and choose the one that best fits your sentence.