He always take subway to Shanghai.
He takes subway to Shanghai all the time.
He goes to Shanghai by taking subway all the time.
American students don't really go to school by riding bicycles.
American students only take bicycles to school for few times.
American students take bicycles to school only for several times.
楼主不好意思了 没空一一解释给你听了 前三句是 他总是乘地铁去上海， 后三句是美国学生很少骑车去上学
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