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c5h11no2
The subject of a sentence is the do-er of the action. For example: Sam drived a car.

"Sam" is the subject
"Drived" is the verb
"A" is an indefinite article  
"Car" is the object, because it receives the action.
recklessstudy
The subject is basically the main person or thing. A subject is a noun (person, place, thing, etc.). The sunject is what is doing the action