You can cross the river by ferry.

你可以乘渡船过河。

We used to cross the river by ferry.

我们以往是靠渡船过河的。

Can I take a ferry to cross the river?

你问对方可以乘轮渡过江吗？

Can I cross the river?

我过得了这条河吗？

There's another way to cross the river.

还有一种路可以过桥。