Classroom talks

Dialogues from a standard 3 class room (between two students Tom the smart and Johnny the genius & the teacher)
Tom: Teacher, teacher; is the bus is male or female?
Teacher: Hmm… (Thinks…)
Johnny: It's female
Tom: But y Johnny?
Johnny: B-coz everybody enters in it.
Teacher is in trouble while Tom in doubt hearing this answer.
Tom: If bus is female and everybody enters in then y bus do not get pregnant?
Johnny: B-coz all enters from back door.
Teacher is now in deep trouble while Tom becomes more curious.
Tom insists: But driver and the checker enter from front door?
Johnny: You didn't notice ever!! They wear hat before entering.