When you have to interrupt:

• I’m sorry to interrupt but…
• I hate to interrupt but…
• I’m sorry to cut this short but…
• Sorry to interrupt but may I ask a question?
• May I add something quickly?
• I don’t mean to be rude but may I interrupt quickly?
• I’m terribly sorry to interrupt you but…
• Sorry to interrupt but I just noticed the time and I need to…
• Excuse me but may I jump in here?

After being interrupted:

• You didn’t let me finish.
• Where was I?
• Anyway …As I was saying …
• Please let me finish.

Allowing an interruption:

• No problem. Go ahead.
• Sure. What do you think?
• Is there anything I can do for you?
• Sure, What’s your point?