проверьте пожалуйста правильно ли определена форма и функция инфинитива!

1. THe teacher allowed us to use reference material while writing the report.
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2. We were sorry to find out that most of the museums we wanted to see that day were closed.
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3. One of the students had to miss quite a number of lessons.
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4. To go on with this discussion is to waste time.
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