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Questions & Answers about Estou apaixonada por ti.
Why does the sentence use Estou instead of Sou?
Does apaixonada change depending on who is speaking?
In English we say "in love with". Why does this sentence use por instead of com?
In Portuguese, the fixed expression is estar apaixonado por (which is closer to "impassioned by"). Prepositions rarely match up perfectly between English and Portuguese, so it is best to memorize apaixonado por as a set phrase.
Why do we use ti instead of tu at the end of the sentence?
The word tu is used when "you" are the subject doing the action. Whenever "you" comes immediately after a preposition like por, it must change to the prepositional object pronoun ti.