培训学校用英语说是training school。
例句：
1、this year my mother took me to the training school of alexander to join extra-curricular english learning.
汉语意思：今年我*带我去了一个叫*的英语培训学校参加课外英语补习。
2、she personally started a training school.
汉语意思：她亲自创办了一所培训学校。
3、sudents often go to summer school so they can ease their class low during the school year.
汉语意思：学生常常会去暑期培训学校学习，因而他们下一学年的学习才会轻松些。