Bother:But the house is already pretty clean and tidy!Sister

題目：

Bother:But the house is already pretty clean and tidy!Sister:Yes,but it's not "mother clean"!
"mother

解答：

mother 在這裡當程度副詞用.表示"媽媽所定義的那般乾淨",這是家庭里兩兄妹的對話,妹妹挺幽默
再問： mother怎麼會有副詞的詞性