must neck
Regular verb: neck - necked- necked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must neck
you must neck
he must neck
we must neck
you must neck
they must neck 	I must be necking
you must be necking
he must be necking
we must be necking
you must be necking
they must be necking	I must have necked
you must have necked
he must have necked
we must have necked
you must have necked
they must have necked	I must have been necking
you must have been necking
he must have been necking
we must have been necking
you must have been necking
they must have been necking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not neck
you must not neck
he must not neck
we must not neck
you must not neck
they must not neck 	I must not be necking
you must not be necking
he must not be necking
we must not be necking
you must not be necking
they must not be necking	I must not have necked
you must not have necked
he must not have necked
we must not have necked
you must not have necked
they must not have necked	I must not have been necking
you must not have been necking
he must not have been necking
we must not have been necking
you must not have been necking
they must not have been necking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I neck?
must you neck?
must he neck?
must we neck?
must you neck?
must they neck? 	must I be necking?
must you be necking?
must he be necking?
must we be necking?
must you be necking?
must they be necking? 	must I have necked?
must you have necked?
must he have necked?
must we have necked?
must you have necked?
must they have necked? 	must I have been necking?
must you have been necking?
must he have been necking?
must we have been necking?
must you have been necking?
must they have been necking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not neck?
must you not neck?
must he not neck?
must we not neck?
must you not neck?
must they not neck? 	must I not be necking?
must you not be necking?
must he not be necking?
must we not be necking?
must you not be necking?
must they not be necking? 	must I not have necked?
must you not have necked?
must he not have necked?
must we not have necked?
must you not have necked?
must they not have necked? 	must I not have been necking?
must you not have been necking?
must he not have been necking?
must we not have been necking?
must you not have been necking?
must they not have been necking?