Teacher-“Right children, can a…

Teacher-“Right children, can anyone give me a sentence with a full stop?”
Only Little “Johnny’s hand goes up.”
Teacher-“Fine, go ahead Johnny”
Teacher-“She’s isn’t a sentence and has no full stop”
Johnny-“But I heard my brother and his mate say it last night”
Johnny-“His mate was fucking my brothers blow up doll when cum started dribbling out, so my brother said She’s full, stop