could bike
Regular verb: bike - biked- biked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could bike
you could bike
he could bike
we could bike
you could bike
they could bike 	I could be biking
you could be biking
he could be biking
we could be biking
you could be biking
they could be biking	I could have biked
you could have biked
he could have biked
we could have biked
you could have biked
they could have biked	I could have been biking
you could have been biking
he could have been biking
we could have been biking
you could have been biking
they could have been biking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't bike
you couldn't bike
he couldn't bike
we couldn't bike
you couldn't bike
they couldn't bike 	I couldn't be biking
you couldn't be biking
he couldn't be biking
we couldn't be biking
you couldn't be biking
they couldn't be biking	I couldn't have biked
you couldn't have biked
he couldn't have biked
we couldn't have biked
you couldn't have biked
they couldn't have biked	I couldn't have been biking
you couldn't have been biking
he couldn't have been biking
we couldn't have been biking
you couldn't have been biking
they couldn't have been biking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I bike?
could you bike?
could he bike?
could we bike?
could you bike?
could they bike? 	could I be biking?
could you be biking?
could he be biking?
could we be biking?
could you be biking?
could they be biking? 	could I have biked?
could you have biked?
could he have biked?
could we have biked?
could you have biked?
could they have biked? 	could I have been biking?
could you have been biking?
could he have been biking?
could we have been biking?
could you have been biking?
could they have been biking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I bike?
couldn't you bike?
couldn't he bike?
couldn't we bike?
couldn't you bike?
couldn't they bike? 	couldn't I be biking?
couldn't you be biking?
couldn't he be biking?
couldn't we be biking?
couldn't you be biking?
couldn't they be biking? 	couldn't I have biked?
couldn't you have biked?
couldn't he have biked?
couldn't we have biked?
couldn't you have biked?
couldn't they have biked? 	couldn't I have been biking?
couldn't you have been biking?
couldn't he have been biking?
couldn't we have been biking?
couldn't you have been biking?
couldn't they have been biking?