how引導方式狀語從句用how+動詞原形+其他，how作狀語用how+形容詞/副詞。

How much, how many, how often, how long, how well, how about, how is, how do, how can。

疑問詞how表示疑問的how＋主語＋謂語；詢問方式用how to+動詞原形；問時間how+ lasting / long；問價格how much / many；問程度how + 形容詞。