Mary shouts loudly ??

形容 [ 動作 ]shout是用adverb.

complement.用在形容/人/事/物/.不能有動態存在.

Both adverb and complement are acceptable as adverb is a part of speech that modifies the verb and complement is a group of words that add extra meanings to the subject and verb structures.

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Loudly 是 adverb 副詞，用來修飾動詞 shout。就正如 He walks slowly 中的 slowly 一樣。