conversion

"The student is representing the country of France in the class presentation. "

""Large proportions of the class failed the test, indicating the material was too difficult." "

"to interchange places"

"My teacher made a proposition for a new class project: a school-wide recycling drive. "

"Attendance at the meeting is required."

"The spilled coffee permanently stained the white carpet. "

"A kettle converts water into steam."

"It took him only twenty minutes to perform the task."

"a successful use of medicine;  a successful experiment;  a successful enterprise"

"The alchemists sought to transform lead into gold."

"The school is advertising a new after-school program for students. "

"the performance of an undertaking or a duty"