must spot-check
Regular verb: spot-check - spot-checked- spot-checked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must spot-check
you must spot-check
he must spot-check
we must spot-check
you must spot-check
they must spot-check 	I must be spot-checking
you must be spot-checking
he must be spot-checking
we must be spot-checking
you must be spot-checking
they must be spot-checking	I must have spot-checked
you must have spot-checked
he must have spot-checked
we must have spot-checked
you must have spot-checked
they must have spot-checked	I must have been spot-checking
you must have been spot-checking
he must have been spot-checking
we must have been spot-checking
you must have been spot-checking
they must have been spot-checking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not spot-check
you must not spot-check
he must not spot-check
we must not spot-check
you must not spot-check
they must not spot-check 	I must not be spot-checking
you must not be spot-checking
he must not be spot-checking
we must not be spot-checking
you must not be spot-checking
they must not be spot-checking	I must not have spot-checked
you must not have spot-checked
he must not have spot-checked
we must not have spot-checked
you must not have spot-checked
they must not have spot-checked	I must not have been spot-checking
you must not have been spot-checking
he must not have been spot-checking
we must not have been spot-checking
you must not have been spot-checking
they must not have been spot-checking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I spot-check?
must you spot-check?
must he spot-check?
must we spot-check?
must you spot-check?
must they spot-check? 	must I be spot-checking?
must you be spot-checking?
must he be spot-checking?
must we be spot-checking?
must you be spot-checking?
must they be spot-checking? 	must I have spot-checked?
must you have spot-checked?
must he have spot-checked?
must we have spot-checked?
must you have spot-checked?
must they have spot-checked? 	must I have been spot-checking?
must you have been spot-checking?
must he have been spot-checking?
must we have been spot-checking?
must you have been spot-checking?
must they have been spot-checking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not spot-check?
must you not spot-check?
must he not spot-check?
must we not spot-check?
must you not spot-check?
must they not spot-check? 	must I not be spot-checking?
must you not be spot-checking?
must he not be spot-checking?
must we not be spot-checking?
must you not be spot-checking?
must they not be spot-checking? 	must I not have spot-checked?
must you not have spot-checked?
must he not have spot-checked?
must we not have spot-checked?
must you not have spot-checked?
must they not have spot-checked? 	must I not have been spot-checking?
must you not have been spot-checking?
must he not have been spot-checking?
must we not have been spot-checking?
must you not have been spot-checking?
must they not have been spot-checking?