添削結果を受け取りました。正しい英文を書くのは難しいことを実感しますがその内添削箇所ゼロとなるように努力したいと思います。

The teacher asked Sam who had signed the Declaration of Independence. “I don’t know, and I don’t care,” the boy replied rudely.
Later the teacher called both the student and his father to his office and explained the incident to the father. The teacher was expecting the father to scold Sam about his bad attitude and, in addition, to encourage him to study history harder.
Contrary to the expectation of the teacher, however, the father 30 years before had been just like Sam that day, and the father himself had paid almost no attention to history back then, either. As a result, the father didn’t know what the Declaration of Independence was to that day.
The word “independence” rang a bell, however. That was the word Sam had begun using whenever he got into trouble, expressing his desire to be independent from his home. The father jumped to the following conclusion; Sam wrote the declaration of independence at home with a bunch of his bratty friends, and signed it; Sam didn’t admit that to the teacher; Sam’s attitude to the teacher was the reason why he and Sam were summoned together. “You must tell the truth,” the father angrily told his son. “If you signed it, admit it!”