generally speaking,when(taken)according to the instructions,the drug has no side effect

问题描述:

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...