【到底是该用was还是用were?在ifIwereyou或ifyouwereme这样的句型中,是不是两句都是用were?还有在ifIwereinyourshoes和ifyouwereinmyshoes中也是,两句都是用were的吗?那什么时候才会用到was?】

　　到底是该用was还是用were?

　　在ifIwereyou或ifyouwereme这样的句型中,是不是两句都是用were?

　　还有在ifIwereinyourshoes和ifyouwereinmyshoes中也是,两句都是用were的吗?

　　那什么时候才会用到was?