could collectivise
Regular verb: collectivise - collectivised- collectivised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could collectivise
you could collectivise
he could collectivise
we could collectivise
you could collectivise
they could collectivise 	I could be collectivising
you could be collectivising
he could be collectivising
we could be collectivising
you could be collectivising
they could be collectivising	I could have collectivised
you could have collectivised
he could have collectivised
we could have collectivised
you could have collectivised
they could have collectivised	I could have been collectivising
you could have been collectivising
he could have been collectivising
we could have been collectivising
you could have been collectivising
they could have been collectivising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't collectivise
you couldn't collectivise
he couldn't collectivise
we couldn't collectivise
you couldn't collectivise
they couldn't collectivise 	I couldn't be collectivising
you couldn't be collectivising
he couldn't be collectivising
we couldn't be collectivising
you couldn't be collectivising
they couldn't be collectivising	I couldn't have collectivised
you couldn't have collectivised
he couldn't have collectivised
we couldn't have collectivised
you couldn't have collectivised
they couldn't have collectivised	I couldn't have been collectivising
you couldn't have been collectivising
he couldn't have been collectivising
we couldn't have been collectivising
you couldn't have been collectivising
they couldn't have been collectivising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I collectivise?
could you collectivise?
could he collectivise?
could we collectivise?
could you collectivise?
could they collectivise? 	could I be collectivising?
could you be collectivising?
could he be collectivising?
could we be collectivising?
could you be collectivising?
could they be collectivising? 	could I have collectivised?
could you have collectivised?
could he have collectivised?
could we have collectivised?
could you have collectivised?
could they have collectivised? 	could I have been collectivising?
could you have been collectivising?
could he have been collectivising?
could we have been collectivising?
could you have been collectivising?
could they have been collectivising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I collectivise?
couldn't you collectivise?
couldn't he collectivise?
couldn't we collectivise?
couldn't you collectivise?
couldn't they collectivise? 	couldn't I be collectivising?
couldn't you be collectivising?
couldn't he be collectivising?
couldn't we be collectivising?
couldn't you be collectivising?
couldn't they be collectivising? 	couldn't I have collectivised?
couldn't you have collectivised?
couldn't he have collectivised?
couldn't we have collectivised?
couldn't you have collectivised?
couldn't they have collectivised? 	couldn't I have been collectivising?
couldn't you have been collectivising?
couldn't he have been collectivising?
couldn't we have been collectivising?
couldn't you have been collectivising?
couldn't they have been collectivising?