Grammar is a subjuct that everyone enjoys.

The classes are very intersting

Several students sleep during that period of time when we study grammar.

Our theory instructors are very intelligent, honest and hardworking individuals and they teach us with skilled professionalism.

Verb is an action Word;

Grammar is a (subjuct)subject that everyone enjoys.Grammar is a subject and enjoys is a Verb

The classes are very (intersting)interesting

Several students sleep during that period of time when we study grammar.

Our theory instructors are very intelligent, honest and hardworking individuals and they teach us with skilled professionalism.