Question

In places where there are rivers and lakes,students usually

Answer 1

1.in places where there are rivers and lakes,此为地点状语从句

2.by boat 是固定搭配,by+交通工具,代表乘该交通工具,如by car,就是开车的意思.

3.In Japan,most students takes trains to school.

如果按第二条来处理,即：In Japan,most students go to school by train.

这就是他们的区别.