must execute
Regular verb: execute - executed- executed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must execute
you must execute
he must execute
we must execute
you must execute
they must execute 	I must be executing
you must be executing
he must be executing
we must be executing
you must be executing
they must be executing	I must have executed
you must have executed
he must have executed
we must have executed
you must have executed
they must have executed	I must have been executing
you must have been executing
he must have been executing
we must have been executing
you must have been executing
they must have been executing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't execute
you mustn't execute
he mustn't execute
we mustn't execute
you mustn't execute
they mustn't execute 	I mustn't be executing
you mustn't be executing
he mustn't be executing
we mustn't be executing
you mustn't be executing
they mustn't be executing	I mustn't have executed
you mustn't have executed
he mustn't have executed
we mustn't have executed
you mustn't have executed
they mustn't have executed	I mustn't have been executing
you mustn't have been executing
he mustn't have been executing
we mustn't have been executing
you mustn't have been executing
they mustn't have been executing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I execute?
must you execute?
must he execute?
must we execute?
must you execute?
must they execute? 	must I be executing?
must you be executing?
must he be executing?
must we be executing?
must you be executing?
must they be executing? 	must I have executed?
must you have executed?
must he have executed?
must we have executed?
must you have executed?
must they have executed? 	must I have been executing?
must you have been executing?
must he have been executing?
must we have been executing?
must you have been executing?
must they have been executing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I execute?
mustn't you execute?
mustn't he execute?
mustn't we execute?
mustn't you execute?
mustn't they execute? 	mustn't I be executing?
mustn't you be executing?
mustn't he be executing?
mustn't we be executing?
mustn't you be executing?
mustn't they be executing? 	mustn't I have executed?
mustn't you have executed?
mustn't he have executed?
mustn't we have executed?
mustn't you have executed?
mustn't they have executed? 	mustn't I have been executing?
mustn't you have been executing?
mustn't he have been executing?
mustn't we have been executing?
mustn't you have been executing?
mustn't they have been executing?