杰克是班里最高的学生英语怎么说

① “杰克人很好，他是班里最受欢迎的男孩”的英语翻译

Jack is so easy-going that he is the most popular boy in my class. 这是复合句

Jack is an easy-going person, so he is the most popular boy in my class. 这是简单句
Jack is easy to get along with, so he is the most popular boy in my class. 这是简单句的另一种表达

Good luck！

② (我们选杰克做我们的班长) 翻译成英语怎么说

We elected Jack as our monitor.