Simone
Ⅰ . be good at / in 意思接近于 do well in. “在（某方面）出色；擅长……”。 be good at / in 强调一种笼统情况，而do well in 可表示一种情况，也可指在具体的一次活动中表现出色。 be good at 的反义词组为：be poor (weak) at (in). do well in 的反义词组为：do badly in. 如： ① Mary is good at / in maths. = Mary does well in maths. 玛丽数学很好（指情况）。= 玛丽数学学得很好。 ② Tom did well in (不宜用be good at.指具体一次亩团)that English test / sports meeting.汤姆在那次英语考试中（运动会中）考得很好（表现出色）。 ③ Wu Dong does badly in his lessons. = Wu Dong is weak / poor / at / in his lessons.吴冬功课不好。（指情况） ④ Mei Ying did badly in the high jump 梅英在蔽耐芹跳高比赛中成绩不好。（具体一次，不宜替换。） ⑤ Mei Ying is weak / poor in / at high jump.梅英不善于跳高。（指笼统情况） Ⅱ . do well 和 do badly 可单独使用，表一种情况；而 be good / weak / poor 一定要借助于介词 in 或 at, 强调在某一个方面宏毕，才能表达一个完整的意思。如： He does well / badly at school. 他在学校里功课很好/很差。 I hope I can help you！满意请采纳
