do well in后面加动词的ing形式，即动名词形式。因为"in"是介词，介词后面需要跟名词、动名词或者代词，所以不能直接跟动词原形，需要将其变为动名词形式，即加ing。
do well in的用法
do well i的意思是“在…成绩好；在…做得好；在…表现好”，in后面要接动名词形式，即动词的ing形式。
常见句型
Some of us do well in swimming.
我们中有些人擅长游泳。
I do well in playing computer games.
我擅长电脑游戏。
He will do well in that work because he has a lot on the ball.
他会做好这件事，因为他很有一手。
do well in例句
To do well in your exams this year, turn off the TV, silence your mobile, and review your work regularly.
要想在今年的`考试中取得好成绩，关掉电视，把手机调成静音，定期复习功课。
She should do well in her studies this year—she's very focused.
今年她的功课应该学得好，她的注意力很集中。
You have to be highly competitive to do well in sport these days.
如今你必须有强烈的竞争意识才能在体育运动中取得好成绩。