He is good at speaking English.

His apraxia makes it difficult for him to lead a normal life.

He has retained his ability to produce speech even after brain damage.

She overcame speech production disorder after brain damage.

He walked fast towards the school.

He ran to the station at a fast pace.

Your passport has already lost its effectiveness.

This medicine will lose its effectiveness after the expiration date.

He slid on his knees on the floor to pick up the pen he dropped.

He moved around the room on his knees.