Question

Найдите и исправьте ошибки во временных формах глаголов, обратите особое внимание на построение вопросительных и отрицательных предложений. Переведите исправленное предложение.
6. Why this material become brittle? 7. Poor quality materials was the reason for product defects. 8. Will the worker replaced the faulty part of the machine? 9. In the early period of the Industrial Revolution, one large steam engine has given the power to drive all the machines in a factory. 10. The chief engineer will be discuss the new designs with the Production department at 2 p.m. tomorrow.

Answer 1

Why did this material become brittle?
Poor quality materials were the reason for product defects
Will the worker replace the faultu pard of the machine?
-
The chief engineer will be discussing the new designs
Насчет 9 не уверен, я там ничего не нашел