must cover
Regular verb: cover - covered- covered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cover
you must cover
he must cover
we must cover
you must cover
they must cover 	I must be covering
you must be covering
he must be covering
we must be covering
you must be covering
they must be covering	I must have covered
you must have covered
he must have covered
we must have covered
you must have covered
they must have covered	I must have been covering
you must have been covering
he must have been covering
we must have been covering
you must have been covering
they must have been covering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not cover
you must not cover
he must not cover
we must not cover
you must not cover
they must not cover 	I must not be covering
you must not be covering
he must not be covering
we must not be covering
you must not be covering
they must not be covering	I must not have covered
you must not have covered
he must not have covered
we must not have covered
you must not have covered
they must not have covered	I must not have been covering
you must not have been covering
he must not have been covering
we must not have been covering
you must not have been covering
they must not have been covering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cover?
must you cover?
must he cover?
must we cover?
must you cover?
must they cover? 	must I be covering?
must you be covering?
must he be covering?
must we be covering?
must you be covering?
must they be covering? 	must I have covered?
must you have covered?
must he have covered?
must we have covered?
must you have covered?
must they have covered? 	must I have been covering?
must you have been covering?
must he have been covering?
must we have been covering?
must you have been covering?
must they have been covering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not cover?
must you not cover?
must he not cover?
must we not cover?
must you not cover?
must they not cover? 	must I not be covering?
must you not be covering?
must he not be covering?
must we not be covering?
must you not be covering?
must they not be covering? 	must I not have covered?
must you not have covered?
must he not have covered?
must we not have covered?
must you not have covered?
must they not have covered? 	must I not have been covering?
must you not have been covering?
must he not have been covering?
must we not have been covering?
must you not have been covering?
must they not have been covering?