"Tomorrow is my birthday."
Translation:Domani è il mio compleanno.
old comment, but I see nobody has answered. You have to have the article (the) somewhere in the sentence. In english it's not like that. Just remember that in italian it's like that.
I understand you might have learned this in the past year, just answering in case anyone else comes across this and doesn't understand it
why do I get a mistake, lose a heart when I said the correct words but in a different order? This does not make sense. I wrote "E il mio compleanno domani
because even in Italian there's a certain way in positioning the words in the sentence. It is called sintassi