could devitalise
Regular verb: devitalise - devitalised- devitalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could devitalise
you could devitalise
she could devitalise
we could devitalise
you could devitalise
they could devitalise 	I could be devitalising
you could be devitalising
she could be devitalising
we could be devitalising
you could be devitalising
they could be devitalising	I could have devitalised
you could have devitalised
she could have devitalised
we could have devitalised
you could have devitalised
they could have devitalised	I could have been devitalising
you could have been devitalising
she could have been devitalising
we could have been devitalising
you could have been devitalising
they could have been devitalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't devitalise
you couldn't devitalise
she couldn't devitalise
we couldn't devitalise
you couldn't devitalise
they couldn't devitalise 	I couldn't be devitalising
you couldn't be devitalising
she couldn't be devitalising
we couldn't be devitalising
you couldn't be devitalising
they couldn't be devitalising	I couldn't have devitalised
you couldn't have devitalised
she couldn't have devitalised
we couldn't have devitalised
you couldn't have devitalised
they couldn't have devitalised	I couldn't have been devitalising
you couldn't have been devitalising
she couldn't have been devitalising
we couldn't have been devitalising
you couldn't have been devitalising
they couldn't have been devitalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I devitalise?
could you devitalise?
could she devitalise?
could we devitalise?
could you devitalise?
could they devitalise? 	could I be devitalising?
could you be devitalising?
could she be devitalising?
could we be devitalising?
could you be devitalising?
could they be devitalising? 	could I have devitalised?
could you have devitalised?
could she have devitalised?
could we have devitalised?
could you have devitalised?
could they have devitalised? 	could I have been devitalising?
could you have been devitalising?
could she have been devitalising?
could we have been devitalising?
could you have been devitalising?
could they have been devitalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I devitalise?
couldn't you devitalise?
couldn't she devitalise?
couldn't we devitalise?
couldn't you devitalise?
couldn't they devitalise? 	couldn't I be devitalising?
couldn't you be devitalising?
couldn't she be devitalising?
couldn't we be devitalising?
couldn't you be devitalising?
couldn't they be devitalising? 	couldn't I have devitalised?
couldn't you have devitalised?
couldn't she have devitalised?
couldn't we have devitalised?
couldn't you have devitalised?
couldn't they have devitalised? 	couldn't I have been devitalising?
couldn't you have been devitalising?
couldn't she have been devitalising?
couldn't we have been devitalising?
couldn't you have been devitalising?
couldn't they have been devitalising?