What is the correct way to write the scene heading for a scene of a school bus on a city road at 7:30 A. M.?

Int. School Bus - Morning

I/E. SCHOOL BUS - MORNING

Explanation:

The I/E label is for locations that are inside as well as outside, which applies to an automobile on a highway. The tutorial uses the example "a scene that involves an automobile racing along a highway", which perfectly applies to this question.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."