C. Say the vocabulary : Action Verbs Part 4

We use "When" to ask about time. We can use "When" to ask for days - Monday to Sunday, months - January to December, and clock time 12:00 a.m. to 12:00 p.m.
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We can also use "When" to ask for periods of the day (for example: in the morning, in the evening, at night, in the afternoon)
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我們使用「當」要詢問時間。我們可能使用「當」要要求天-星期一到星期天，月-1 月到 12 月，記錄時間午夜12 點到中午 12 點
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我們也可能使用「當」要要求今日的時期（例如：上午，在當天晚上，晚上，在下午）