could counterweight
Regular verb: counterweight - counterweighted- counterweighted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could counterweight
you could counterweight
she could counterweight
we could counterweight
you could counterweight
they could counterweight 	I could be counterweighting
you could be counterweighting
she could be counterweighting
we could be counterweighting
you could be counterweighting
they could be counterweighting	I could have counterweighted
you could have counterweighted
she could have counterweighted
we could have counterweighted
you could have counterweighted
they could have counterweighted	I could have been counterweighting
you could have been counterweighting
she could have been counterweighting
we could have been counterweighting
you could have been counterweighting
they could have been counterweighting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't counterweight
you couldn't counterweight
she couldn't counterweight
we couldn't counterweight
you couldn't counterweight
they couldn't counterweight 	I couldn't be counterweighting
you couldn't be counterweighting
she couldn't be counterweighting
we couldn't be counterweighting
you couldn't be counterweighting
they couldn't be counterweighting	I couldn't have counterweighted
you couldn't have counterweighted
she couldn't have counterweighted
we couldn't have counterweighted
you couldn't have counterweighted
they couldn't have counterweighted	I couldn't have been counterweighting
you couldn't have been counterweighting
she couldn't have been counterweighting
we couldn't have been counterweighting
you couldn't have been counterweighting
they couldn't have been counterweighting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I counterweight?
could you counterweight?
could she counterweight?
could we counterweight?
could you counterweight?
could they counterweight? 	could I be counterweighting?
could you be counterweighting?
could she be counterweighting?
could we be counterweighting?
could you be counterweighting?
could they be counterweighting? 	could I have counterweighted?
could you have counterweighted?
could she have counterweighted?
could we have counterweighted?
could you have counterweighted?
could they have counterweighted? 	could I have been counterweighting?
could you have been counterweighting?
could she have been counterweighting?
could we have been counterweighting?
could you have been counterweighting?
could they have been counterweighting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I counterweight?
couldn't you counterweight?
couldn't she counterweight?
couldn't we counterweight?
couldn't you counterweight?
couldn't they counterweight? 	couldn't I be counterweighting?
couldn't you be counterweighting?
couldn't she be counterweighting?
couldn't we be counterweighting?
couldn't you be counterweighting?
couldn't they be counterweighting? 	couldn't I have counterweighted?
couldn't you have counterweighted?
couldn't she have counterweighted?
couldn't we have counterweighted?
couldn't you have counterweighted?
couldn't they have counterweighted? 	couldn't I have been counterweighting?
couldn't you have been counterweighting?
couldn't she have been counterweighting?
couldn't we have been counterweighting?
couldn't you have been counterweighting?
couldn't they have been counterweighting?