He always does his homework at eight.(always劃線,提問）

題目：

He always does his homework at eight.(always劃線,提問）
請幫我解答,而且說明爲什麼要這麼做.

解答：

How often does he do his homework at eight?
因爲always表示頻率,所以用how often 提問.does作爲助動詞,do 作爲行爲動詞,所以這樣說.