上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY Passive Voice Usually,the passive voice should be used in writing X >1.I used the electric identifier to solve the problem. > active voice ) >2.The electric identifier was used to solve the problem. passive voice 1B回后 Passive Voice  Usually, the passive voice should be used in writing.  1. I used the electric identifier to solve the problem.  ( active voice ).  2. The electric identifier was used to solve the problem.  ( passive voice ) 