"Ten pies jest duży."

Translation: This dog is big.

[MuratNasyrov]

In what time I need to say "duży", "duża", "duże"?

[immery]

when you need to say "big" in nominative - adjective before a noun in nominative ( subject, after "to") or noun/it is big. (without noun),

Duży is for masculine nouns - singular
Duża is for feminine nouns- singular
Duże is for neuter nouns - singular , and not masculine personal nouns -plural ( plural masculine not personal; feminine and neuter nouns)
Duzi is for masculine personal plural nouns.

[MuratNasyrov]

Thank you, very much. :-)

[sweater-strypes]

Here's a good link to help with adjectives that I found useful:
http://mylanguages.org/polish_adjectives.php

[GJZ1994]

The polish translate sounds wrong to me. It's ten pies, so it's masculine, but correct answer is said to contain duże instead of duży. Could u help?

[va-diim]

On mine it does show duży not duże

[Jellei]

It would be indeed wrong, but I have no idea where you could see such an answer... we need a screenshot.

[aelise2552]

it sounds like the pronunciation is "jest-eh-duzy"?

[cosmicstresshead]

This is an effect of the text-to-speech engine distinguishing between the hard t and soft d between the two words.

[RoboticRocketeer]

Wait... I thought jest required instrumental case. What am I forgetting...

[immery]

In this sentence, you have adjective "alone". In this type of sentence adjective is in nominative.

Ten piest jest duży. (this dog is big)
On jest dużym psem. (he/it is a big dog)

[RoboticRocketeer]

A very good distinction to know. Thank you!

[kekmaster220]

Duży - masculine, singular

Duża - feminine, singular

Duże - neuter, singular

[abcdef933419]

Note... Duże is also plural (non masuculine personal)

[deactivated user]

Ten pies just dizzy.
God, the hardest thing about learning polish so far is to not see English words!