Should tell you right on the front fenders, either with a badge or (in later years) a decal. If it's not marked at all, and the interior is rather Spartan with idiot lights instead of full gauges, it's a Base.
Give us a hint -- what year,and what options? Headrests integral with the seat backs, or separate pads in two posts? Two or three-spoke steering wheel? Leather steering wheel or plastic? Steel wheels or alloy? Carpet, or rubber mat on the floor? Full console (extends from the dashboard to the back of the front seats) or a "mini" console (only surrounds the actual shifter, and doesn't extend as far back as the front seats).