500. Misuse of weight as a verb
(X) Have you weighted the letter?
(O) Have you weighed the letter?
"Weight" is a noun and we can't use it as a verb. The verb is "weigh" (without the "t").
501. Misuse of good for well
(X) The goalkeeper plays very good.
(O) The goalkeeper plays very well.
"Good" is an adjective only, and we can't use it as an adverb.
502. Misuse of adjective for adverb
(X) The little girl sang beautiful.
(O) The little girl sang beautifully.
We use an adverb, and not an adjective, to qualify a verb.
Note: After verbs such as "look, feel, sound, taste, smell" use an adjective
instead of an adverb: Sugar tastes sweet (not sweetly).