When do you have to use perfect or volmaakt? I had the same example twice and it accepted them as synonyms, is it always the case or is there a specific rule?
They are synonyms. The only thing to look out for is that there also is a verb volmaken (to complete, for instance used to refer to coalition governments to complete a term).
I wondered the same thing, it might just be the exact same sentence and you infer it from context. Any native speakers know if that's the case?
@blackzoid: That syntax works in spoken English, but it's definitely a colloquialism or even slang. It's not grammatically correct, even if youd be understood.
(Ps why can't I reply to people on the app? Running Android 6.0)