could winterise
Regular verb: winterise - winterised- winterised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could winterise
you could winterise
he could winterise
we could winterise
you could winterise
they could winterise 	I could be winterising
you could be winterising
he could be winterising
we could be winterising
you could be winterising
they could be winterising	I could have winterised
you could have winterised
he could have winterised
we could have winterised
you could have winterised
they could have winterised	I could have been winterising
you could have been winterising
he could have been winterising
we could have been winterising
you could have been winterising
they could have been winterising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't winterise
you couldn't winterise
he couldn't winterise
we couldn't winterise
you couldn't winterise
they couldn't winterise 	I couldn't be winterising
you couldn't be winterising
he couldn't be winterising
we couldn't be winterising
you couldn't be winterising
they couldn't be winterising	I couldn't have winterised
you couldn't have winterised
he couldn't have winterised
we couldn't have winterised
you couldn't have winterised
they couldn't have winterised	I couldn't have been winterising
you couldn't have been winterising
he couldn't have been winterising
we couldn't have been winterising
you couldn't have been winterising
they couldn't have been winterising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I winterise?
could you winterise?
could he winterise?
could we winterise?
could you winterise?
could they winterise? 	could I be winterising?
could you be winterising?
could he be winterising?
could we be winterising?
could you be winterising?
could they be winterising? 	could I have winterised?
could you have winterised?
could he have winterised?
could we have winterised?
could you have winterised?
could they have winterised? 	could I have been winterising?
could you have been winterising?
could he have been winterising?
could we have been winterising?
could you have been winterising?
could they have been winterising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I winterise?
couldn't you winterise?
couldn't he winterise?
couldn't we winterise?
couldn't you winterise?
couldn't they winterise? 	couldn't I be winterising?
couldn't you be winterising?
couldn't he be winterising?
couldn't we be winterising?
couldn't you be winterising?
couldn't they be winterising? 	couldn't I have winterised?
couldn't you have winterised?
couldn't he have winterised?
couldn't we have winterised?
couldn't you have winterised?
couldn't they have winterised? 	couldn't I have been winterising?
couldn't you have been winterising?
couldn't he have been winterising?
couldn't we have been winterising?
couldn't you have been winterising?
couldn't they have been winterising?