when i wrote
"jsem nepotreboval tri domy"
It said it was wrong and that i needed "Ja" in the beginning
("Ja jsem nepotreboval tri domy")
Is there a reason for this? Asking as with most verbs we dont need to use the subject
Jsem has to be the second word, so it's either: Já jsem nepotřeboval tři domy. or Nepotřeboval jsem tři domy.
But "nepotrebovala jsem tri domu" wasn't accepted. It said, that correct will be "Tři domy jsem nepotřeboval."
You need "domy", not "domu" or "domů". It must be accusative, genitive is very archaic here.
Very difficult to see the difference between tři and tří. I thought bought 1st and last sentence were correct
"Tři" is nominative (kdo?, co?) and accusative (koho?, co?), "tří" is genitive (bez koho?, bez čeho?).