must strop
Regular verb: strop - stropped- stropped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must strop
you must strop
he must strop
we must strop
you must strop
they must strop 	I must be stropping
you must be stropping
he must be stropping
we must be stropping
you must be stropping
they must be stropping	I must have stropped
you must have stropped
he must have stropped
we must have stropped
you must have stropped
they must have stropped	I must have been stropping
you must have been stropping
he must have been stropping
we must have been stropping
you must have been stropping
they must have been stropping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't strop
you mustn't strop
he mustn't strop
we mustn't strop
you mustn't strop
they mustn't strop 	I mustn't be stropping
you mustn't be stropping
he mustn't be stropping
we mustn't be stropping
you mustn't be stropping
they mustn't be stropping	I mustn't have stropped
you mustn't have stropped
he mustn't have stropped
we mustn't have stropped
you mustn't have stropped
they mustn't have stropped	I mustn't have been stropping
you mustn't have been stropping
he mustn't have been stropping
we mustn't have been stropping
you mustn't have been stropping
they mustn't have been stropping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I strop?
must you strop?
must he strop?
must we strop?
must you strop?
must they strop? 	must I be stropping?
must you be stropping?
must he be stropping?
must we be stropping?
must you be stropping?
must they be stropping? 	must I have stropped?
must you have stropped?
must he have stropped?
must we have stropped?
must you have stropped?
must they have stropped? 	must I have been stropping?
must you have been stropping?
must he have been stropping?
must we have been stropping?
must you have been stropping?
must they have been stropping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I strop?
mustn't you strop?
mustn't he strop?
mustn't we strop?
mustn't you strop?
mustn't they strop? 	mustn't I be stropping?
mustn't you be stropping?
mustn't he be stropping?
mustn't we be stropping?
mustn't you be stropping?
mustn't they be stropping? 	mustn't I have stropped?
mustn't you have stropped?
mustn't he have stropped?
mustn't we have stropped?
mustn't you have stropped?
mustn't they have stropped? 	mustn't I have been stropping?
mustn't you have been stropping?
mustn't he have been stropping?
mustn't we have been stropping?
mustn't you have been stropping?
mustn't they have been stropping?