She goes to school by underground.她乘地铁上学.
She takes the underground to school.她乘地铁上学.
She transports herself to school by underground.她用地铁将自己送去学校
英式的地铁是"underground",美式的地铁是"subway".
She goes to school by subway.
She takes the subway to school.
She transports herself to school by subway.
第三句是很生硬的句式.学生日常通常都用前两句.