The correct sentence is A) My car is old and gets bad gas mileage. Having bad gas mileage is an ongoing thing that will never change unless you get a different car, so none of the other choices make sense.
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My brother cut the grass on Saturday.
It is a simple sentence since it contains a subject (<em>My brother</em>) and a verb (<em>cut)</em>. It also has a direct object (<em>the grass</em>) and a prepositional phrase of time (<em>on Saturday</em>). It is important to state that a sentence must have a complete idea and stands on its own. That's why this type of sentence is called independent clause.
