"I could not drink wine."
Translation:Δεν θα μπορούσα να πίνω κρασί.
In that case the main English sentence is wrong. "I could not drink wine" means "I was not able to drink wine". It does not mean "I would not be able to drink wine" at all. The negative rules out the conditional sense.
If you write it in contracted form "I couldn't drink wine" it becomes clear that this is not a conditional.
Check out these examples of this sentence with more context added though.
Example 1 PersonA-"You are going to fall asleep if you drink wine." PersonB-"I could not drink wine."
Example 2 "I could not drink wine. I had fallen asleep."
One is future tense as a conditional statement and the other is past tense. I think they should both be marked correct without the added context, because even if the original excersize comes from the paticular tense skill section, you could still get the sentence in generic practice mode (which is how I got here).
No - "I could drink wine" may be conditional or past, "I could not drink wine" can only be past. Your example 1 is not a negative conditional for "could", because the "not" is linked to "drink". It is a colloquial construct meaning "I could get round the problem by not drinking wine" / "I could avoid drinking wine." The Greek equivalent would seem to me to be "Θα μπορούσα να μην πίνω κρασί" - altho I stand to be corrected on that.
So the English, as a translation exercise into Greek, needs to be changed, because it simply doesn't mean the same thing.
Yeah I didn't understand what conditional meant before. I think "I could not drink wine" just by itself can only be past tense, because there is no condition given in the sentence. I think couldn't could be used in a conditional if there is a condition stating if something happened differently than what actually happened, like if someone was holding a glass and said "if I had fallen asleep, I couldn't drink wine" and then took a sip. Replacing "couldn't" with "wouldn't be able" both forms seem to sound right to me.
I actually had a comment on here before asking about θα μπορούσα να μην πίνω κρασί, but I deleted it last night because I was thinking it was wrong and didnt want to confuse people, you have got me wondering again now though.
I'm sure it's unintentional, but you have trapped us with a sentence that seems clearly to be in the past tense. If we were asked to translate the Greek expression, it would be "I wouldn't want to drink wine". Where I live, we would never say "I could not drink wine" in the way it's suggested here.