must fossilise
Verbo regular: fossilise - fossilised- fossilised

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must fossilise
you must fossilise
he must fossilise
we must fossilise
you must fossilise
they must fossilise 	I must be fossilising
you must be fossilising
he must be fossilising
we must be fossilising
you must be fossilising
they must be fossilising	I must have fossilised
you must have fossilised
he must have fossilised
we must have fossilised
you must have fossilised
they must have fossilised	I must have been fossilising
you must have been fossilising
he must have been fossilising
we must have been fossilising
you must have been fossilising
they must have been fossilising	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not fossilise
you must not fossilise
he must not fossilise
we must not fossilise
you must not fossilise
they must not fossilise 	I must not be fossilising
you must not be fossilising
he must not be fossilising
we must not be fossilising
you must not be fossilising
they must not be fossilising	I must not have fossilised
you must not have fossilised
he must not have fossilised
we must not have fossilised
you must not have fossilised
they must not have fossilised	I must not have been fossilising
you must not have been fossilising
he must not have been fossilising
we must not have been fossilising
you must not have been fossilising
they must not have been fossilising	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I fossilise?
must you fossilise?
must he fossilise?
must we fossilise?
must you fossilise?
must they fossilise? 	must I be fossilising?
must you be fossilising?
must he be fossilising?
must we be fossilising?
must you be fossilising?
must they be fossilising? 	must I have fossilised?
must you have fossilised?
must he have fossilised?
must we have fossilised?
must you have fossilised?
must they have fossilised? 	must I have been fossilising?
must you have been fossilising?
must he have been fossilising?
must we have been fossilising?
must you have been fossilising?
must they have been fossilising? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not fossilise?
must you not fossilise?
must he not fossilise?
must we not fossilise?
must you not fossilise?
must they not fossilise? 	must I not be fossilising?
must you not be fossilising?
must he not be fossilising?
must we not be fossilising?
must you not be fossilising?
must they not be fossilising? 	must I not have fossilised?
must you not have fossilised?
must he not have fossilised?
must we not have fossilised?
must you not have fossilised?
must they not have fossilised? 	must I not have been fossilising?
must you not have been fossilising?
must he not have been fossilising?
must we not have been fossilising?
must you not have been fossilising?
must they not have been fossilising?