When the direct object of a verb (except tener) is a person, it is preceded by a. It isn’t used if a number precedes the object though. The pronouns alguien (somebody), alguno (someone), nadie (nobody), and ninguno (no one) require a as well, when used as the direct object.
Veo a Juan. I see John.
Conozco a tu amiga. I know your friend.
Veo a alguien. I see somebody.
Links
http://www.ielanguages.com/spanish2.html
Next: 031 Spanish Preterite Tense
Word Document at: 030 Spanish Impersonal “a”
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