Speak good English: Get it correct

Let's continue to look at the incorrect sentences in which the reflexive pronoun myself has been used instead of personal pronouns.

Sentence 3 is:
My teacher and myself solved the Maths question.
In this sentence, both my teacher and myself are being used as the subject of the verb solved.
But, as we have learnt, a reflexive pronoun cannot be the subject of a verb, even if that reflexive pronoun is joined to a noun to perform the function of a subject.
So we must look for a personal pronoun in the subject case to join the noun teacher to form the subject.
The correct sentence, therefore, is:
My teacher and I solved the Maths questions.
Note that if we write or say:
I and my teacher solved the Maths questions,
it is incorrect.
Can you explain why it is incorrect to write or say:
I and my teacher solved the Maths questions?

Well, the reason is that my teacher is in the third person (it can be replaced by the pronoun he), while the pronoun I is in the first person.
We have learnt that in English, the third person takes precedence over the first person, and that is why
I and my teacher ..... or
I and he .....
is incorrect.
Sentence 4 is:
Mr Oti punished the class and myself.

Here, the reflexive pronoun myself is being used with the noun class as the object of the verb punished.
But, once again, a reflexive pronoun cannot be used as the object of a verb, for which reason we must use a personal pronoun in the objective case.
The correct sentence should be:
Mr Oti punished the class and me.
Note that if we do away with the noun class, the sentence will be:
Mr Oti punished me.

We cannot use the personal pronoun I in this case because I is in the subject case --- it can only be the subject of a verb and not the object of a verb.
In other words, the pronoun I, just like he, she, we and they, can perform actions but cannot suffer from or receive actions.

The pronouns you and it are the same whether they perform actions or receive actions.
Egs:
You punished the boys.
The teacher punished you.
It bit my little finger.
I killed it.