That's a tough question because prepositions don't translate
well in Spanish. Generally I would say either:
a
or
para
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He, she, and it are pronouns, not prepositions.
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There are three main types of prepositions: time prepositions (e.g. at, on, in), place prepositions (e.g. above, below, between), and direction prepositions (e.g. to, from, towards).