Please, correct this sentence:
(Past Simple, Past Perfect or Past Perfect Continuous):
The moment his teacher
was telling him not to, he
did that again. She
hadn t know what to do with him before, and she certainly
didin t know what to do with him now, she
had been thinking to herself, and
decided to call his parents. She
has worked for 25 years now, and he
was the hardest case she
had ever had in her whole career as a teacher.