I can swim across the river.为什么用across而不是cross?

I can swim across the river.为什么用across而不是cross? I`m sure that I can swim across the river.同义句 same and I can swim across the river对swim across the river 提问 问句应该怎么写（）（）same（）（）（）？这样的问句形式 I can swim I can swim I can swim.同义句：I ( ) ( ) ( ) swim 英语语法知识是怎样的?I can not swim across the river without a piece of wood.为什么用across而不用through? Can you imagine _____ the river? A. me to swim c. me swimming across D. I swim 原因 B. my swimming不用排除法. We can swim across the big River.为什么不用through I can also swim 还是I also can swim I can swim very well.can是谓语?swim呢? 改写句子：I can't swim.Linda can't swim,either.I can't swim.( )( ) Linda. 用swim across造句 I can help kids ___ (swim)swim为什么用原形 Can you swim? Yes, I went _____(swim) last Sunday. Yes,I can swim.的问句是什么 i can swim(改为一般疑问句) monkeys,think,don't,swim,I,can