"Estas calças são muito grandes."

Translation: These trousers are too large.

[nefnefnef]

why is "These pants are very big" wrong?

[emeyr]

That was my answer too and it was accepted as correct.

[Sr.Noble]

Why is "These pants are too big." wrong?

[cloudhorizon]

it shouldn't be, just report it. :)

[ChrisGull]

Both are accepted now, but I'm unsure of how you're able to distinguish between "too large" and "very large" in Portuguese? They have two distinct meanings in English; "very large" doesn't mean they won't fit, but "too large" means they definitely won't fit.

[Davu]

It is possible to distinguish between them in Portuguese, it is the difference between "grandes demais" and "muito grandes". I think the reason "too large" is also accepted for "muito grandes" is because in the spoken language placing emphasis on the word "muito" conveys this meaning as well. That is my reasoning, anyway; see: http://www.duolingo.com/comment/61905

[ChrisGull]

Thanks for the clarification!

[JaneilsonHD]

Only to confirm Davu's comment.
I'm Brazilian and is Exactly this.

[madisonpru2]

Was is it not muitas grandes?

[Paulenrique]

Adverbs never change, so it is always "Muito".