Early on in my lessons I was asked to repeat a phrase into the microphone, but this has stopped. I think that perhaps I touched the "skip this" button or something like that. I would like to get the oral repetition back, especially as I have started with Spanish.
Check your settings. You have the option to turn the microphone on and off. You might have done that by accident somehow.
I mean, now I am not asked to repeat the phrase. would the computer know if my microphone is turned off?
You mean you no longer get the microphone exercises in lessons? If the microphone is turned off in settings, then Duolingo knows not to use it.