We can swim across the big River.为什么不用through

We can swim across the big River.为什么不用through 介词和副词的区别在下面的几个句子中的across哪个是介词,哪个是副词?He suddenly saw Mary across the room.a bridge across the river.We swam across the river.We can't swim across.He couldn't get the idea across to the class.请 the river is about two hunderd f____ wide ,we all can swim across it can't,they,well,swim(.) they can't swim( ) .(good) 改写句子：I can't swim.Linda can't swim,either.I can't swim.( )( ) Linda. we can't across from here?事实是他们不能过去 那应该怎么回答 Jack couldn't swim across the river.改同意句为Jack wasn't( )( )swim across the river. 我们不能长时间游泳的英文翻译We can't swim ()a()time The river is .(rise) after the rain .So we can't swim in it. We can't swim in the river in summer.(改为祈使句) We can't swim in the river in summer .(现在进行时)怎么做? The pool is so small that we can't swim in it.同义句 I can swim across the river.为什么用across而不是cross? We can swim in s填空. 用swim across造句 monkeys,think,don't,swim,I,can can't,that,you,in,river,swim