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be动词：I am doing my homework.改为What are you doing?从这句话中可以看出 I（第一人称）变为you(第一人称）时be动词要用第一人称的 要是改为he/she/it就要换为第三人称的is。其次 要是
I was doing my homework改为What were you doing?时，就要变成一般过去式了 关键看人称和时态
助动词：He always does important things for us改为What does he always do?时就要看人称了，he是第三人称，所以用does 如果变成过去式He did an important thing for us改为What did he do?就要看时态，用一般过去式
手打 望采纳 谢谢
I was doing my homework改为What were you doing?时，就要变成一般过去式了 关键看人称和时态
助动词：He always does important things for us改为What does he always do?时就要看人称了，he是第三人称，所以用does 如果变成过去式He did an important thing for us改为What did he do?就要看时态，用一般过去式
手打 望采纳 谢谢
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人称、时态
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