you can see the river across which the boy swam

问题描述:

you can see the river across which the boy swam
把这句话分析一下

you(主语) can see(谓语) the river(宾语) across which the boy swam(定语从句,注意:介词前置时指物只能用关系代词which)
翻译:你可以看到那个男孩游过的那条河