Write A letter and a teacher on the Board and then explain that the character is A letter a is slightly large. Large letters used to write the opening sentence and the name of the people.
A teacher and a letter written on the board and explained that A is the main character is a minor character. Large font used to start a sentence and write people's names.
I wrote a letter A A and on the board and explains that A is large letters A is small, large letters alphabet used in writing at the beginning of a sentence. And the person's name.