"I want a plate" - plate must be in the accusative case, "я хочу тарелку". The plate is a plate "of rice", which means rice must be in the genitive case риса, no matter what case тарелка is. Therefore "я хочу тарелку риса".
In this case using genitive works like adding "of" in English. "A plate of rice. In your example you could say "the boy of Mom", but of course that sounds weird.
I was marked wrong for this too, but I think it should be fine in this context. "I'd like" and "I want" are interchangeable in English here.
If 'терелку ' can mean plate or bowl (according to the duolingo dropdown translation options) why is it marked wrong if I translate this sentence ' I want a bowl of rice'?
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"I'd like a plate of rice" is more idiomatically correct English. "I want a plate of rice" comes off as a bit rude.
Agreed that it comes across as rude in English when used on another person in a demanding manner. I can say it as a statement of fact without it being rude, I feel. Also, the point is to learn the Russian language, not idiomatically correct English translations for the Russian language. :)
Is ice included here just to trick people who wanted to pick rice instead? Mean.
i just thought that maybe russians have a word for a plate used for rice, like my native tongue does
In addition to what Theron126 has already said, rice is not a traditional Russian food, so we definitely don't have any special plates designated for that purpose.
On the other hand, in Russian we make a distinction between "мелкие/плоские тарелки"="shallow/flat plates" (i.e., just "plates" in English) and "глубокие тарелки"="deep plates" (i.e., "bowls" in English). In the case of rice, I would typically be asking for the second kind, hence I would translate this sentence to English as "I would like a bowl of rice".
They don't, they don't generally have plates used specifically for rice. Тарелка риса, like "a plate of rice" in English, just means a plate that has rice on it right now.