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Questions & Answers about Sei una ragazza.
Why is there no word for "you" in this sentence?
In Italian, subject pronouns like tu (you) are usually left out because the verb form already tells you who is doing the action. Sei specifically means "you are", so adding tu isn't necessary unless you want to emphasize it.
The lesson is about definite articles like la (the), so why does this sentence use una?
What is the base verb form of sei?
Sei comes from the verb essere, which means "to be". It is an irregular verb, meaning its forms don't follow a predictable pattern, so you just have to memorize that sei means "you are".