Tienes que comprar dos kilos de naranjas.

Questions & Answers about Tienes que comprar dos kilos de naranjas.

Why do we use que after tienes here?
The phrase tener que means "to have to" do something. If you just used tienes on its own, it would mean you physically own something, like in tienes naranjas (you have oranges). Adding que turns it into an obligation.
Why does comprar end in "-ar" instead of being conjugated for "you"?
After the phrase tienes que, the main action verb always stays in its basic dictionary form, called the infinitive. Since tienes already tells us "you" are doing it, comprar (to buy) doesn't need to change.
Where is the word for "you" in this sentence?
The word for "you" (informal) is tú, but in Spanish, the verb ending usually tells you who the subject is. Because tienes only ever goes with tú, the pronoun is often dropped because it's not needed for the meaning.
Why do we need de between the amount and the item?
Just like in English where we say "two kilos of oranges", Spanish uses de (of) to connect a quantity or measurement to the item being measured. You will also see this in phrases like un vaso de agua (a glass of water).

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