In the following sentences, identify the correct form of the verb.

Many Canadian citizens who live in Montreal speak/speaks French.
She speak/speaks highly of the new president of the company.
Grace usually sleep/sleeps longer than her sister.
Newborn babies sleep/sleeps for 16 to 17 hours a day.
Jorge suffer/suffers from chronic back pain.
People with Alzheimer's disease suffer/suffers from memory loss.