"My teacher will be very angry" 的英文表达是 "My teacher will be very angry."
来源：这是一个相当常见的句子结构，可以在各种场合中使用。
例句：
"I didn't do my homework, so my teacher will be very angry." 我没做作业，所以老师会非常生气。
"I'm late for class again, my teacher will be very angry." 我又迟到了，老师会非常生气。
"I got a bad grade on my test, my teacher will be very angry." 我考试成绩不好，老师会非常生气。