You might disagree that grammar ought to be important, but as long as it is important and as long as English class is meant to teach it, it’s inexcusable for the teacher not to know it.
If it was an English class and she was speaking English, then anything she was saying counts as demonstration.
Similarly, if the math teacher is writing equations all over the board in front of the class and they contain a lot of mistakes, anyone who notices should point that out, even if it’s not being done for the purposes of teaching the class.
You might disagree that grammar ought to be important, but as long as it is important and as long as English class is meant to teach it, it’s inexcusable for the teacher not to know it.
Indeed, but how is constantly interrupting her class by demonstrating your social superiority helping?
It’s not. Interrupting class to let the other students know that what the teacher just demonstrated was incorrect, is helping the other students.
Ah, sorry, was she teaching the bad thing, or just talking in her own voice?
If it was an English class and she was speaking English, then anything she was saying counts as demonstration.
Similarly, if the math teacher is writing equations all over the board in front of the class and they contain a lot of mistakes, anyone who notices should point that out, even if it’s not being done for the purposes of teaching the class.