He'd never been in a class before and he was not even sure that he should have been teaching.他以前从未教过课，甚至不确定自己该不该教课。Exam results are sometimes used as a measure of teacher effectiveness.考试成绩有时被用作衡量教师教课效果的依据。When I taught, I would assign a topic to children which they would write about.我教课时会给孩子们布置一个题目，让他们就这个题目写点东西。