must fossilize
Regular verb: fossilize - fossilized- fossilized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fossilize
you must fossilize
he must fossilize
we must fossilize
you must fossilize
they must fossilize 	I must be fossilizing
you must be fossilizing
he must be fossilizing
we must be fossilizing
you must be fossilizing
they must be fossilizing	I must have fossilized
you must have fossilized
he must have fossilized
we must have fossilized
you must have fossilized
they must have fossilized	I must have been fossilizing
you must have been fossilizing
he must have been fossilizing
we must have been fossilizing
you must have been fossilizing
they must have been fossilizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not fossilize
you must not fossilize
he must not fossilize
we must not fossilize
you must not fossilize
they must not fossilize 	I must not be fossilizing
you must not be fossilizing
he must not be fossilizing
we must not be fossilizing
you must not be fossilizing
they must not be fossilizing	I must not have fossilized
you must not have fossilized
he must not have fossilized
we must not have fossilized
you must not have fossilized
they must not have fossilized	I must not have been fossilizing
you must not have been fossilizing
he must not have been fossilizing
we must not have been fossilizing
you must not have been fossilizing
they must not have been fossilizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fossilize?
must you fossilize?
must he fossilize?
must we fossilize?
must you fossilize?
must they fossilize? 	must I be fossilizing?
must you be fossilizing?
must he be fossilizing?
must we be fossilizing?
must you be fossilizing?
must they be fossilizing? 	must I have fossilized?
must you have fossilized?
must he have fossilized?
must we have fossilized?
must you have fossilized?
must they have fossilized? 	must I have been fossilizing?
must you have been fossilizing?
must he have been fossilizing?
must we have been fossilizing?
must you have been fossilizing?
must they have been fossilizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not fossilize?
must you not fossilize?
must he not fossilize?
must we not fossilize?
must you not fossilize?
must they not fossilize? 	must I not be fossilizing?
must you not be fossilizing?
must he not be fossilizing?
must we not be fossilizing?
must you not be fossilizing?
must they not be fossilizing? 	must I not have fossilized?
must you not have fossilized?
must he not have fossilized?
must we not have fossilized?
must you not have fossilized?
must they not have fossilized? 	must I not have been fossilizing?
must you not have been fossilizing?
must he not have been fossilizing?
must we not have been fossilizing?
must you not have been fossilizing?
must they not have been fossilizing?