Thais might have locked the door
The door might have been locked by Thais
The motorcycle must have caused the accident.
The accident must have been caused by the motorcycle
She can't have lost the keys.
The keys can't have been lost
Diana might have eaten all the cookies
All the cookies might have been eaten by Diana
Teacher Marvin had to have created this game
This game had to have been created by teacher Marvin
He might have left the door unlocked.
The door might have been left unlocked
The burglars must have stolen the painting.
The painting must have been stolen by the burglar
They must have sold the house.
The house must have been sold
Someone must have broken the window.
The window must have been broken
They must have completed the project on time.
The project must have been completed on time