Really wish the audio was with this type of question instead of in the comments.
I think, this person means that you can't listen to the pronunciation of this sentence until you tap on the 'comments'. Because this sentence is included in one of the "select the missing word" exercises which don't include the audio option.
Oh, yes, I understand now, thanks. At least the audio is available I guess, even if it is in the comments. Just a few more clicks! :)
Είναι is third person plural and singular. Like He/She/It is and they are. Είσαι is you are.