I'm going to send an angry email to my teacher about how she's never teaches us anything
In what way does she not teach you anything?
She never teaches us anything and she even forgot her appointment with me once.
You should talk to her boss. Sending an angry email will not solve anything. It will just makes everything worse.
You are full of shit and you are not one to talk.
Sorry that you feel that way, I'm just saying that sending angry letters often doesn't solve anything. Talking to their superior would likely be better.