Question

He not to open the window before classes yesterday​

Answer 1

Ответ: the window in our class wasn't open until yesterday.

Объяснение:

Answer 2

The sentence you provided appears to have a grammatical error. It should be written as:

"He was not supposed to open the window before classes yesterday."

This corrected sentence conveys that someone was not allowed or instructed not to open the window before their classes yesterday.