"I'm sorry."

So what were the different ways of saying sorry in the programme?

1) The simple ones. These are just statements on their own:

• Sorry.
• I'm sorry.
• I'm so sorry.
• I'm really sorry.

2) The classic one: Sorry I'm late.

3) Sorry about (something).

• Sorry about this
• Sorry about the damage to your bike

4) Sorry for (doing something). Normally this is followed by a verb in the -ing form.

• Sorry for losing your bike
• Sorry for being so smelly

5) Saying sorry without saying sorry – I apologise for...

• I apologise for calling you an idiot. It wasn't very nice.

source: http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-19/session-4