过去式和过去完成时的区别

过去式和过去完成时的区别
我现在有点分不清过去式和过去完成时了.
我现在脑子里有俩个定义,
过去式是过去发生的事情用过去式,
过去完成时是在过去的过去做过的事情.
我现在有这么几道题,并且再讲讲这俩个在做题的时候怎样才能更好的分别出来.
1.---You needn't have given the car a wash.
---No.But my father ___ me to do it.
A.had asked B.asked
C.asks D.would ask
2.Our teacher told us that James Watt ___ the steam engine.
A.invented B.had invented
C.has invented D.was inventing