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Which is right?
□ 1. I don't know how to do it.
□ 2. I don't know how to do.
○1. I don't know how to do it.
2. I don't know how to do.
錯誤句中必須用it表達要執行的動作，但在I don't know what to do之後就不可接it，因what一字已確定該作之事。
Use "it" after "how" because you must refer to something ("it") that you are using to perform the action. Do not use "it" in the following sentence: "I don't know what to do". Because "what" here means "the thing(s) which".
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