Verb 'to be': past tense negative:
I was not too happy after my exam. I wasn't sure I would pass.
You were not too happy either . You weren't sure you would pass.
The exam was not easy. It wasn't the usual multiple-choice exam.
We were not ready for the exam. We weren't well prepared.
Most students were not expecting such a difficult exam.
There was a lot of complaining.
There were a lot of unhappy students.