do well in后加动词ing形式。意思是：成绩好，做得好。例句：Some persons do well in their lessons.有的人功课好。
do well in后面加什么
do well in后面加动词ing形式，也就是动名词。因为in是介词，介词后面加名词、代词或者动名词，do well in意思是“擅长；在……方面做得好；在……干得好”，do well in具体指某件事做得好。
动词－ing形式包括传统语法的动名词和现在分词两个部分。动词的－ing形式具有动词的特征，同时又具有名词、形容词和副词的特征，因此它可以在句中作主语、表语、定语、宾语、宾语补足语和状语。又称现在分词、现在进行式、动名词。
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。