"I did not need three houses."

Translation: Tři domy jsem nepotřeboval.

[RickardHol3]

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

[endless_sleeper]

Jsem has to be the second word, so it's either: Já jsem nepotřeboval tři domy. or Nepotřeboval jsem tři domy.

[HelgaPass]

But "nepotrebovala jsem tri domu" wasn't accepted. It said, that correct will be "Tři domy jsem nepotřeboval."

[VladaFu]

You need "domy", not "domu" or "domů". It must be accusative, genitive is very archaic here.

[ThomasDeki]

Very difficult to see the difference between tři and tří. I thought bought 1st and last sentence were correct

[JanLyko]

"Tři" is nominative (kdo?, co?) and accusative (koho?, co?), "tří" is genitive (bez koho?, bez čeho?).

https://en.wiktionary.org/wiki/t%C5%99i#Declension