The images you provided are related to grammar exercises, specifically focusing on the active and passive voice. Here are the answers to the questions based on the information in the images:

Question 48:

Active voice: The director notifies all the workers that they will have to work extra hard this month.
Passive voice: All the workers are notified by the director that they will have to work extra hard this month.
Question 49:

Active voice: How many trees have they cut down to build that fence?
Passive voice: How many trees have been cut down to build that fence?
Question 50:

Active voice: I had my nephew paint the gate last week.
Passive voice: I had the gate painted by my nephew last week.