Protesters blocking Hong Kong tram lines

The speaker conveys an apology by saying 'I'm sorry.'

How might the tone of voice affect the meaning of 'I'm sorry'?

• It can convey sincerity

• It has no effect

• It makes it sound more formal

• It can make it sound sarcastic

What are some alternative phrases to express an apology?

• I regret that

• I am happy

• I don't care

• Please forgive me