explaining investigations/procedures with the present passive

explaining and reassuring for medical students explaining investigations/procedures with the present passive active sentences say who is doing an action. passive sentences don't necessarily say who is doing the action, though they can. positive verbs not requiring objects (by not necessary) the doctor attaches the needle to the syringe. active: passive: the needle is attached to the syringe (by the doctor). we don't need to say who it is done by because it is part of a procedure. negative active: a doctor does not use a tourniquet in this procedure. passive: a tourniquet is not used in this procedure. verbs requiring objects (by necessary) active: only experienced doctors perform this procedure. passive. this procedure is performed only by experienced doctors …

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