I was putting things in order in my room when I came across my English exercise book which I used in the 1st grade of high school. All you need to know is that the school I was at in the 1st grade was a private school, and the men who were going there were not especially talented for languages. I noted down some of the weirdest mistakes. I enclosed my variant as well in case you cannot understand.

Some of them(which have higher level grammar such as conditional or question tag) were mistakes by some of my classmates at primary school.
I goeding home when I sead a wolf.
I was going home when I saw a wolf.You are English, doesn't you?
You are English, Aren't you?We was opened the window to come the air in
We opened the window to let air come inStop to speak!
Stop speaking!I lived on Budapest for I born
I have been living in Budapest since I was bornTen and two is tentwo
Ten plus two make twelveTentwos
TwentyEnglishes are polite mans
English people are politeI made a stupid sentence myself as well:
If I would can speak English I cannoted write a bad sentence like this.
If I could speak English, I couldn't write a bad sentence like this one.
Just for fun. Enjoy!