英和和英

to assign a part to each―cast the parts to the actors―cast the actors for the parts

fulfill a role

to do one's duty―play one's part

assignment of parts―a cast of characters

exercise one's part

play its role

to perform one's duty

the action of assigning a task to someone

to play a certain role in something

play a role or part

to follow the stage―tread the stage―walk the boards

to attempt to make someone take a task upon him or herself

to play the villain

to discharge one's trust―acquit oneself （f the charge）

to continue to perform one's duty

to execute a mission―fulfil a mission

to play the leading part

the role of giving directions

to perform a service―discharge one's duty―perform one's office―discharge one's functions―acquit oneself （of the charge）―do one's part―do one's work―accomplish one's task

to assign a part to each

discharge one's duties

to cast the actors for parts

an act of doing chore

perform in order to get a role

to play a subordinate part―play second fiddle

acquit oneself of one's duty

in an official role

to play an important part―play a weighty part

to go on the stage―take to the stage

play an important role