什么时候用there was什么时候用there were

什么时候用there was什么时候用there were 什么时候用was / were 什么时候用was/were+done 用"There is ..." "There are ..." "There was ..."There were .. 用there was 或there were 填空 过去进行时中的什么时候用was什么时候用were 英语里什么时候用was 什么时候用were 什么时候直接用过去式,什么时候要加was/were? 过去进行时,was 或were 加现在分词,什么时候用were 什么时候用was? there 与they的区别,什么时候用there ,什么时候用there there are none,there is none 用法 什么时候用there are none,什么时候用the there be 句行中什么时候用that什么时候用but呢