In English, saying "I see the car" and "I see Juan" follows the exact same structure. However, in Spanish, there is a special grammar rule. When the direct object of a sentence is a specific person (or a beloved pet), you must put the preposition a before it. We call this the "Personal A".
You must insert the preposition a between the verb and the direct object if the object is:
Examples:
The "Personal A" helps distinguish between a specific person and "just anyone." If you are looking for a person but you don't have a specific individual in mind, you do not use the "a".
The verb tener is a major exception. Generally, it does not use the "Personal A" when expressing possession or kinship, even if the object is a person.
Nuance: You DO use the "Personal A" with tener if it means "to hold" physically, or "to have someone" in a specific state or location.
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