could bicycle
Regular verb: bicycle - bicycled- bicycled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bicycle
you could bicycle
he could bicycle
we could bicycle
you could bicycle
they could bicycle 	I could be bicycling
you could be bicycling
he could be bicycling
we could be bicycling
you could be bicycling
they could be bicycling	I could have bicycled
you could have bicycled
he could have bicycled
we could have bicycled
you could have bicycled
they could have bicycled	I could have been bicycling
you could have been bicycling
he could have been bicycling
we could have been bicycling
you could have been bicycling
they could have been bicycling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bicycle
you couldn't bicycle
he couldn't bicycle
we couldn't bicycle
you couldn't bicycle
they couldn't bicycle 	I couldn't be bicycling
you couldn't be bicycling
he couldn't be bicycling
we couldn't be bicycling
you couldn't be bicycling
they couldn't be bicycling	I couldn't have bicycled
you couldn't have bicycled
he couldn't have bicycled
we couldn't have bicycled
you couldn't have bicycled
they couldn't have bicycled	I couldn't have been bicycling
you couldn't have been bicycling
he couldn't have been bicycling
we couldn't have been bicycling
you couldn't have been bicycling
they couldn't have been bicycling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I bicycle?
could you bicycle?
could he bicycle?
could we bicycle?
could you bicycle?
could they bicycle? 	could I be bicycling?
could you be bicycling?
could he be bicycling?
could we be bicycling?
could you be bicycling?
could they be bicycling? 	could I have bicycled?
could you have bicycled?
could he have bicycled?
could we have bicycled?
could you have bicycled?
could they have bicycled? 	could I have been bicycling?
could you have been bicycling?
could he have been bicycling?
could we have been bicycling?
could you have been bicycling?
could they have been bicycling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bicycle?
couldn't you bicycle?
couldn't he bicycle?
couldn't we bicycle?
couldn't you bicycle?
couldn't they bicycle? 	couldn't I be bicycling?
couldn't you be bicycling?
couldn't he be bicycling?
couldn't we be bicycling?
couldn't you be bicycling?
couldn't they be bicycling? 	couldn't I have bicycled?
couldn't you have bicycled?
couldn't he have bicycled?
couldn't we have bicycled?
couldn't you have bicycled?
couldn't they have bicycled? 	couldn't I have been bicycling?
couldn't you have been bicycling?
couldn't he have been bicycling?
couldn't we have been bicycling?
couldn't you have been bicycling?
couldn't they have been bicycling?