could lift
Regular verb: lift - lifted- lifted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could lift
you could lift
he could lift
we could lift
you could lift
they could lift 	I could be lifting
you could be lifting
he could be lifting
we could be lifting
you could be lifting
they could be lifting	I could have lifted
you could have lifted
he could have lifted
we could have lifted
you could have lifted
they could have lifted	I could have been lifting
you could have been lifting
he could have been lifting
we could have been lifting
you could have been lifting
they could have been lifting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not lift
you could not lift
he could not lift
we could not lift
you could not lift
they could not lift 	I could not be lifting
you could not be lifting
he could not be lifting
we could not be lifting
you could not be lifting
they could not be lifting	I could not have lifted
you could not have lifted
he could not have lifted
we could not have lifted
you could not have lifted
they could not have lifted	I could not have been lifting
you could not have been lifting
he could not have been lifting
we could not have been lifting
you could not have been lifting
they could not have been lifting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I lift?
could you lift?
could he lift?
could we lift?
could you lift?
could they lift? 	could I be lifting?
could you be lifting?
could he be lifting?
could we be lifting?
could you be lifting?
could they be lifting? 	could I have lifted?
could you have lifted?
could he have lifted?
could we have lifted?
could you have lifted?
could they have lifted? 	could I have been lifting?
could you have been lifting?
could he have been lifting?
could we have been lifting?
could you have been lifting?
could they have been lifting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not lift?
could you not lift?
could he not lift?
could we not lift?
could you not lift?
could they not lift? 	could I not be lifting?
could you not be lifting?
could he not be lifting?
could we not be lifting?
could you not be lifting?
could they not be lifting? 	could I not have lifted?
could you not have lifted?
could he not have lifted?
could we not have lifted?
could you not have lifted?
could they not have lifted? 	could I not have been lifting?
could you not have been lifting?
could he not have been lifting?
could we not have been lifting?
could you not have been lifting?
could they not have been lifting?