Both mean "a" or "an" but "un" usually goes with masculine nouns and "una" with feminine: un hermano, una hermana; un amigo, una amiga; un carro, una casa, un tío, una tía.

Un = Masculine (ending "o") Una = Feminine (ending "a")

Yes you could . Yo tengo gives more emphasis .

Tengo - I have tiene - has

Its conjugation for present tense tiene Yo tengo Tu tienes El/ella tiene Nosotros tenemos Ellos/ellas tienen

I put tengo una hermana for I have a sister and was marked incorrect

'Tengo' = I have'. It's indicative mood present tense of 'tener' 'to have'. 'Tenga' is a conjugated form of 'tener' that is found in the imperative and subjunctive moods. You'll meet these later on in the course.

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