He is practicing every day to acquire new skills.

This deal is very beneficial for us.

This deal is greatly beneficial for us.

He is bald.

This economical size shampoo is economical because it can be used for a long period of time.

This economy size shampoo is economical and can be used for a long period of time.

After hearing his explanation, I consented.

He is struggling to understand mathematics.

He completely understood mathematics.

The Tokugawa era is a part of Japanese history.