be good at 意思是擅长干某事
注意be good at后面的动词要用现在分词形式，即ing
1，I am good at playing soccer.我在踢足球方面很擅长。
2，He is good at swimming.他很擅长游泳。
3，My mother is good at cooking.我妈妈擅长烹调。
4，She is good at singing,she is a good singer.她唱歌很好，是一位很棒的歌唱家。
5，My brother is good at learning.我哥哥学习很好。
希望能帮到你，祝天天向上。
