Sorry if I've interrupted/I interrupted you

[EngLearner]

Peter and John are talking to each other. John starts saying something, but before he's finished Peter interrupts him and starts expressing his own thought. John falls silent. Peter stops halfway, says the sentence below, and then continues expressing the thought.

Sorry if I've interrupted/I interrupted you.

Should the simple past or the present perfect be used in this case, or are they both appropriate?

 

[emsr2d2]

Peter and John are talking to each other. John starts saying something (no comma here) but, before he's finished, Peter interrupts him and starts expressing his own thought. John falls silent. Peter stops halfway, says the sentence below, and then continues expressing the thought.

Sorry if I've interrupted/I interrupted you.

Should the simple past or the present perfect be used in this case, or are they both appropriate?

You'll hear both from native speakers.

Note that in second sentence of your text, you don't really need "before he's finished". The verb "interrupt" includes that idea already.

 

[emsr2d2]

It's just occurred to me that, in fact, most native speakers (in the UK, at least) would say "Sorry for interrupting you" or "Sorry to interrupt you, but ...".