weight是名詞,而疑問(wèn)詞中,what 是相當(dāng)于名詞的。
比如問(wèn)你多重,可以問(wèn)how weighty are you (形容詞)或what is your weight(名詞)或how much do you weigh(動(dòng)詞)。再比如問(wèn)你歲數(shù),可以問(wèn)how old(形容詞)are you 或what is your age(名詞)(這個(gè)問(wèn)法不常用)。可以看出,what 用來(lái)代替名詞,How是用來(lái)修飾形容詞或副詞的。