How do I know it's plural? One dress would also be šaty
You don't. How do you know if "those trousers" are singular or plural?
Well, in English there's a difference between "The dresses are long" and "The dress is long". I suppose in Czech it depends on context... Thanks for your reply!
For dresses yes, but for trousers, scissors, eyeglasses?
Why it cannot be "this dress is long"?
That would be "Tyto šaty". The course insists on the difference between "The dress" and "this dress".
So 'jsou' can also be used for singular? Would 'Ty saty je dlouhe' be incorrect? Thank you for the support!
no. "Ty šaty jsou dlouhé." stays the same no matter how many of them. like "Those pants are long." in english. and yes, i know that "pants" are not "šaty".