could mop
Regular verb: mop - mopped- mopped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mop
you could mop
he could mop
we could mop
you could mop
they could mop 	I could be mopping
you could be mopping
he could be mopping
we could be mopping
you could be mopping
they could be mopping	I could have mopped
you could have mopped
he could have mopped
we could have mopped
you could have mopped
they could have mopped	I could have been mopping
you could have been mopping
he could have been mopping
we could have been mopping
you could have been mopping
they could have been mopping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not mop
you could not mop
he could not mop
we could not mop
you could not mop
they could not mop 	I could not be mopping
you could not be mopping
he could not be mopping
we could not be mopping
you could not be mopping
they could not be mopping	I could not have mopped
you could not have mopped
he could not have mopped
we could not have mopped
you could not have mopped
they could not have mopped	I could not have been mopping
you could not have been mopping
he could not have been mopping
we could not have been mopping
you could not have been mopping
they could not have been mopping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I mop?
could you mop?
could he mop?
could we mop?
could you mop?
could they mop? 	could I be mopping?
could you be mopping?
could he be mopping?
could we be mopping?
could you be mopping?
could they be mopping? 	could I have mopped?
could you have mopped?
could he have mopped?
could we have mopped?
could you have mopped?
could they have mopped? 	could I have been mopping?
could you have been mopping?
could he have been mopping?
could we have been mopping?
could you have been mopping?
could they have been mopping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not mop?
could you not mop?
could he not mop?
could we not mop?
could you not mop?
could they not mop? 	could I not be mopping?
could you not be mopping?
could he not be mopping?
could we not be mopping?
could you not be mopping?
could they not be mopping? 	could I not have mopped?
could you not have mopped?
could he not have mopped?
could we not have mopped?
could you not have mopped?
could they not have mopped? 	could I not have been mopping?
could you not have been mopping?
could he not have been mopping?
could we not have been mopping?
could you not have been mopping?
could they not have been mopping?