常見答案：always/usually/sometimes 或 once/twice/… a week
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口說與考試常見句型，易與 how many times 混淆
形式與用法
How often...?
用來詢問某行為/狀態發生的頻率。句型：1) How often + do/does + 主詞 + 動詞原形？2) How often + is/are + 主詞？3) How often + 情態動詞(will/can/should 等) + 主詞 + 動詞原形？回答可用頻率副詞（always, usually, often, sometimes, rarely, never）或具體次數（once/twice/three times a week 等）。
範例：
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How often do you exercise after school?
你放學後多常運動？
其他形式：
How frequently...?
與 How often 意義相同，但語氣較正式、書面。句型與助動詞用法相同（可接 do/does/did、be 動詞或情態動詞）。
範例：
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How frequently does the school bus arrive late?
校車多常遲到？
How many times a [time period] ...?
詢問「明確次數 + 時間單位」，如 a day/week/month。不可再加 often（語意重複）。
範例：
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How many times a week do you practice basketball?
你一週練習幾次籃球？
常見錯誤
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How often you go to cram school?
✓
How often do you go to cram school?
疑問句詢問一般動詞的頻率時，需要助動詞 do/does/did 放在主詞前；原句少了助動詞。
✗
How many often do you exercise?
✓
How often do you exercise?
often 是副詞，不能和 many 連用；many 修飾可數名詞（如 times），不是副詞。
✗
How many times a week do you often practice?
✓
How many times a week do you practice?
How many times a week 已經表達頻率，不需要再加 often，會造成語意重複。
✗
How often are you go to the library?
✓
How often do you go to the library? / How often are you at the library?
be 動詞不可與一般動詞原形並用。描述動作用 do/does + V；描述狀態（在圖書館）才用 be。