can counterweight
Regular verb: counterweight - counterweighted- counterweighted

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

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

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

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