Not a teacher, but here are some things I remember from reading Anne Frank that he might like to consider:
Contrast between how they lived before and how they lived after they went into hiding: eg they could go out, go to school, see friends, have visitors etc, but once in hiding the only people they saw were the friends who brought them food, so she must have been very lonely
Cramped conditions - she had to share her bedroom with an elderly male dentist who did his exercises at 6am!
Small things became big things because there was so little for them to do - an argument with her sister over who was reading a book; when her favourite pen went in the fire by mistake
She had to stay inside the annexe for two years - that's two years without ever walking out into a garden or playing outside.
The constant fear of being found out, and what might happen to them if they were.
There was an episode in the book where she had bad toothache and there was talk of sending her "outside" to see a dentist - the thought of which was both exhilarating and terrifying for her. Another where one of the people who was bringing them food was almost knocked off her bike by solders and she shouted at them - Anne talked about what could have happened if they had searched her, as she was carrying illegal passbooks and food for them.
Don't know if that's any help at all.