When his parents saw him fall down是不是 复合句 要不要saw 和 fall为什么都用过去式
问题描述:
When his parents saw him fall down是不是 复合句 要不要saw 和 fall为什么都用过去式
答
When his parents saw him fall down是不是 复合句 要不要saw 和 fall为什么都用过去式