could vitalise
Regular verb: vitalise - vitalised- vitalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vitalise
you could vitalise
he could vitalise
we could vitalise
you could vitalise
they could vitalise 	I could be vitalising
you could be vitalising
he could be vitalising
we could be vitalising
you could be vitalising
they could be vitalising	I could have vitalised
you could have vitalised
he could have vitalised
we could have vitalised
you could have vitalised
they could have vitalised	I could have been vitalising
you could have been vitalising
he could have been vitalising
we could have been vitalising
you could have been vitalising
they could have been vitalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not vitalise
you could not vitalise
he could not vitalise
we could not vitalise
you could not vitalise
they could not vitalise 	I could not be vitalising
you could not be vitalising
he could not be vitalising
we could not be vitalising
you could not be vitalising
they could not be vitalising	I could not have vitalised
you could not have vitalised
he could not have vitalised
we could not have vitalised
you could not have vitalised
they could not have vitalised	I could not have been vitalising
you could not have been vitalising
he could not have been vitalising
we could not have been vitalising
you could not have been vitalising
they could not have been vitalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vitalise?
could you vitalise?
could he vitalise?
could we vitalise?
could you vitalise?
could they vitalise? 	could I be vitalising?
could you be vitalising?
could he be vitalising?
could we be vitalising?
could you be vitalising?
could they be vitalising? 	could I have vitalised?
could you have vitalised?
could he have vitalised?
could we have vitalised?
could you have vitalised?
could they have vitalised? 	could I have been vitalising?
could you have been vitalising?
could he have been vitalising?
could we have been vitalising?
could you have been vitalising?
could they have been vitalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not vitalise?
could you not vitalise?
could he not vitalise?
could we not vitalise?
could you not vitalise?
could they not vitalise? 	could I not be vitalising?
could you not be vitalising?
could he not be vitalising?
could we not be vitalising?
could you not be vitalising?
could they not be vitalising? 	could I not have vitalised?
could you not have vitalised?
could he not have vitalised?
could we not have vitalised?
could you not have vitalised?
could they not have vitalised? 	could I not have been vitalising?
could you not have been vitalising?
could he not have been vitalising?
could we not have been vitalising?
could you not have been vitalising?
could they not have been vitalising?