For those that are asking about "Das sind" and who enjoy seeing relative links:
das ist/das sind
When it is used with the verb sein, the form das can refer to singular and plural nouns of all three genders:
Wer ist das? – Das ist seine neue Freundin.
Und das sind seine Kinder.
Das ist mein Wagen."
Similar for "Dies sind"
If you're asking whether it's correct English, then yes, it can be.
"Are you really going to those markets? They're so small!" "No they're not! They are big markets!"
i also think there should be grossen, becaus Das indicates it is weak inflection and in pl. nominative case we need en ending, don't we?
The das is not part of the noun phrase große Märkte -- in fact, it's not even the article "the", but a demonstrative pronoun "that" (well, "those" in the natural English sentence).
So there's no article at all in große Märkte and therefore strong inflection is necessary.
Are we talking places to sell or shop or market demographics? (Asian Market, EU Market)
Those can be markets like the Asian Market or events like the Christmas Market (Christkindl Markt) in Nürnberg or the Fischmarkt in Hamburg.
haha, of course. Silly me. Next time no more duolingo before I had my morning coffee... :)
Because it's not a translation of the German sentence.
Your sentence would be Die Märkte sind groß.
Using diese would be like using "These ones" -- you would only do so when you have a particular noun in mind even if you are not saying it. For example, if you are talking about the sights of a city and then you might say "these ones (= these sights) are big markets".
But if you're just introducing a new item with "this/that/these/those" to "point" to something, you'd use neuter singular in German -- das or dies, e.g. Dies sind große Märkte.
Yes, that's one example of their use.
Welcher Markt ist der größte? -- Dieser. "Which market is the biggest one? -- This one."
A shop is not a market.
A shop is usually an individual building; a market is usually either in the open air or in a very large market hall.