must prefertilise
Verbo regular: prefertilise - prefertilised- prefertilised

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must prefertilise
you must prefertilise
he must prefertilise
we must prefertilise
you must prefertilise
they must prefertilise 	I must be prefertilising
you must be prefertilising
he must be prefertilising
we must be prefertilising
you must be prefertilising
they must be prefertilising	I must have prefertilised
you must have prefertilised
he must have prefertilised
we must have prefertilised
you must have prefertilised
they must have prefertilised	I must have been prefertilising
you must have been prefertilising
he must have been prefertilising
we must have been prefertilising
you must have been prefertilising
they must have been prefertilising	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not prefertilise
you must not prefertilise
he must not prefertilise
we must not prefertilise
you must not prefertilise
they must not prefertilise 	I must not be prefertilising
you must not be prefertilising
he must not be prefertilising
we must not be prefertilising
you must not be prefertilising
they must not be prefertilising	I must not have prefertilised
you must not have prefertilised
he must not have prefertilised
we must not have prefertilised
you must not have prefertilised
they must not have prefertilised	I must not have been prefertilising
you must not have been prefertilising
he must not have been prefertilising
we must not have been prefertilising
you must not have been prefertilising
they must not have been prefertilising	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I prefertilise?
must you prefertilise?
must he prefertilise?
must we prefertilise?
must you prefertilise?
must they prefertilise? 	must I be prefertilising?
must you be prefertilising?
must he be prefertilising?
must we be prefertilising?
must you be prefertilising?
must they be prefertilising? 	must I have prefertilised?
must you have prefertilised?
must he have prefertilised?
must we have prefertilised?
must you have prefertilised?
must they have prefertilised? 	must I have been prefertilising?
must you have been prefertilising?
must he have been prefertilising?
must we have been prefertilising?
must you have been prefertilising?
must they have been prefertilising? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not prefertilise?
must you not prefertilise?
must he not prefertilise?
must we not prefertilise?
must you not prefertilise?
must they not prefertilise? 	must I not be prefertilising?
must you not be prefertilising?
must he not be prefertilising?
must we not be prefertilising?
must you not be prefertilising?
must they not be prefertilising? 	must I not have prefertilised?
must you not have prefertilised?
must he not have prefertilised?
must we not have prefertilised?
must you not have prefertilised?
must they not have prefertilised? 	must I not have been prefertilising?
must you not have been prefertilising?
must he not have been prefertilising?
must we not have been prefertilising?
must you not have been prefertilising?
must they not have been prefertilising?