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 must not execute
you must not execute
he must not execute
we must not execute
you must not execute
they must not execute 	I must not be executing
you must not be executing
he must not be executing
we must not be executing
you must not be executing
they must not be executing	I must not have executed
you must not have executed
he must not have executed
we must not have executed
you must not have executed
they must not have executed	I must not have been executing
you must not have been executing
he must not have been executing
we must not have been executing
you must not have been executing
they must not 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 	
must I not execute?
must you not execute?
must he not execute?
must we not execute?
must you not execute?
must they not execute? 	must I not be executing?
must you not be executing?
must he not be executing?
must we not be executing?
must you not be executing?
must they not be executing? 	must I not have executed?
must you not have executed?
must he not have executed?
must we not have executed?
must you not have executed?
must they not have executed? 	must I not have been executing?
must you not have been executing?
must he not have been executing?
must we not have been executing?
must you not have been executing?
must they not have been executing?