So, what is the significance of the word היא? What exactly does it mean, and how do you say it? Thanks!
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I translated it as "Cake is delicious," but I don't understand why that is wrong.
"Cake is delicious" is a statement about all cake. " עוגה טעימה." Literally "cake delicious" meaning "delicious cake" or "a delicious cake" is specific to one piece of cake, usually the cake you've just eaten!
One thing that would be helpful in an instance like this is not to use a period at the end of a sentence fragment. Having the period there suggests that it's a sentence, which in this instance, it isn't.