She drives a car as easily as she rides a bike. "Easy" is also an adverb, but here its meaning would not be the one you want. To drive easily is to have no trouble doing it.
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Marian NedelcuSo, in this context the following form is correct:She drives the car as easy as the bike.Isn't it?I guess I don't know what you mean, or you don't know what I mean. For one thing, you don't drive a bike, you ride it. "She drives the car as easy as the bike" is in no way a natural English sentence, and its meaning is obscure.