bessides saying sorry what do you do to apologise

Answer:
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Besides saying sorry, we also usually promise that we will not repeat such mistakes again to convince him/her, We also always shake hands as a sign of genuine apologies from the heart.

Some of the usual phrases we use as follows :

=> I apologize to you
=> I feel very guilty about what I have done to you
=> I beg your pardon
=> please forgime me .
=> forgive me,please.

*Thanks*

Promise not to repeat it again