could polymerise
Regular verb: polymerise - polymerised- polymerised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could polymerise
you could polymerise
he could polymerise
we could polymerise
you could polymerise
they could polymerise 	I could be polymerising
you could be polymerising
he could be polymerising
we could be polymerising
you could be polymerising
they could be polymerising	I could have polymerised
you could have polymerised
he could have polymerised
we could have polymerised
you could have polymerised
they could have polymerised	I could have been polymerising
you could have been polymerising
he could have been polymerising
we could have been polymerising
you could have been polymerising
they could have been polymerising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't polymerise
you couldn't polymerise
he couldn't polymerise
we couldn't polymerise
you couldn't polymerise
they couldn't polymerise 	I couldn't be polymerising
you couldn't be polymerising
he couldn't be polymerising
we couldn't be polymerising
you couldn't be polymerising
they couldn't be polymerising	I couldn't have polymerised
you couldn't have polymerised
he couldn't have polymerised
we couldn't have polymerised
you couldn't have polymerised
they couldn't have polymerised	I couldn't have been polymerising
you couldn't have been polymerising
he couldn't have been polymerising
we couldn't have been polymerising
you couldn't have been polymerising
they couldn't have been polymerising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I polymerise?
could you polymerise?
could he polymerise?
could we polymerise?
could you polymerise?
could they polymerise? 	could I be polymerising?
could you be polymerising?
could he be polymerising?
could we be polymerising?
could you be polymerising?
could they be polymerising? 	could I have polymerised?
could you have polymerised?
could he have polymerised?
could we have polymerised?
could you have polymerised?
could they have polymerised? 	could I have been polymerising?
could you have been polymerising?
could he have been polymerising?
could we have been polymerising?
could you have been polymerising?
could they have been polymerising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I polymerise?
couldn't you polymerise?
couldn't he polymerise?
couldn't we polymerise?
couldn't you polymerise?
couldn't they polymerise? 	couldn't I be polymerising?
couldn't you be polymerising?
couldn't he be polymerising?
couldn't we be polymerising?
couldn't you be polymerising?
couldn't they be polymerising? 	couldn't I have polymerised?
couldn't you have polymerised?
couldn't he have polymerised?
couldn't we have polymerised?
couldn't you have polymerised?
couldn't they have polymerised? 	couldn't I have been polymerising?
couldn't you have been polymerising?
couldn't he have been polymerising?
couldn't we have been polymerising?
couldn't you have been polymerising?
couldn't they have been polymerising?