Good, Well

Remember that good is an adjective and well is an adverb. To modify a noun, therefore, you should use good.

Incorrect: We’re expecting well weather today.
Correct: We’re expecting good weather today.

To modify a verb, use well instead.

Incorrect: The air conditioner works fairly good.
Correct: The air conditioner works fairly well.

Good and well are most often confused when they follow a linking verb (e.g., be, seem, and appear) or a verb that describes a sensory experience (e.g., taste, look, and feel). A modifier that appears after one of these verbs refers to the subject, not the verb; therefore, the adjective good is the correct choice.

Incorrect: The cookie tastes well.
Correct: The cookie tastes good.

Well, however, should be used after feel or look if it means “in good health.”

Incorrect: After taking the new medication, he began to feel good again.
Correct: After taking the new medication, he began to feel well again.