last month 是过去的时间点,所以句中的动作直接用过去式就ok了那过去式的句子能不能用过去完成时 有没有例子过去式的句子还用过去完成时？一个句子中不可以用两个时态的，过去式和过去完成时是完全不一样的两个概念。The son is the one that came in and told them that his brother had climbed in the basket when it took off and watched it went up Maybe the boy had already fallen out of that craft.看这两句 不是用了 过去完成你知道过去完成时的形式是怎么样的么