Before an object the adjective describes the object, therefore the first sentence implies that the girl is beautiful, pretty and thin, while the second implies that object is beautiful, pretty and thin.
91-the first, fourth and fifth are wrong. We cannot have a problem on/for/to but we can have a problem of/in.
92–the sentence has repetition of “I was on the roof of this building, she was on the roof of this building”, to avoid it we can have “she and I were on the roof of this building and I saw someone push her from behind” you cannot say “pushing and dropping her on the floor”
The first is correct, though the last three are wrong. You can have “I want to see her face not made up” or “I don’t want to see her face made up”.
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