i'm kinda unhappy with how this lessons jumps between the indicative and the subjunctive. i don' want to just memorize this word, i wanted to be able to go logically from one tense to the next =/ hope there' some higher sense here that i'm just not understanding at the moment.
And this is what you would say in a casual conversation? "Ich habe lezte Nacht nicht schlafen können."? I'm having trouble with when we can use Präteritum in casual conversation . . . ? Is it truly only the case for a handful of verbs (like sein and werden, etc.)? Or can you use it when you are discussion something in the past, that is no longer the case in the present?
Oh, someone else answered that question under another sentence. Yes, "konnte" is the simple pass tense of können, so "I wasn't able to sleep (in the past)". "könnte" is the subjuntive form in present tense. So it's like "I couldn't sleep (right now)". But here the sentence says "last night" so.....