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generally speaking,when(taken)according to the instructions,

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/18 22:26:20
generally speaking,when(taken)according to the instructions,the drug has no side effect
为什么不能taking to take to be taken
when后面所跟的动词的主语与主句主语一致.
  when done:表示动作完成后发生主句描绘的情形,与主句主语是被动的关系
  When asked by the police,he said that he remembered nothing .
  when being done:与主句同时发生,主句主语与该动作是被动关系;
  例如 when being laughed at,the boy smiled and walked away.
  when doing:与主句同时发生,主动.
  例如 when doing the exam,we should be careful
  when to do 不适用于这种情况
  when to do 中的不定式表示“什么时候要去做什么事”
  例如 I don't know when to hand in my homework,
因此,在该句子中 “吃药”
drug 和 take 是被动关系,用taken