could fly
Irregular verb: fly - flew- flown

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fly
you could fly
he could fly
we could fly
you could fly
they could fly 	I could be flying
you could be flying
he could be flying
we could be flying
you could be flying
they could be flying	I could have flown
you could have flown
he could have flown
we could have flown
you could have flown
they could have flown	I could have been flying
you could have been flying
he could have been flying
we could have been flying
you could have been flying
they could have been flying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't fly
you couldn't fly
he couldn't fly
we couldn't fly
you couldn't fly
they couldn't fly 	I couldn't be flying
you couldn't be flying
he couldn't be flying
we couldn't be flying
you couldn't be flying
they couldn't be flying	I couldn't have flown
you couldn't have flown
he couldn't have flown
we couldn't have flown
you couldn't have flown
they couldn't have flown	I couldn't have been flying
you couldn't have been flying
he couldn't have been flying
we couldn't have been flying
you couldn't have been flying
they couldn't have been flying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fly?
could you fly?
could he fly?
could we fly?
could you fly?
could they fly? 	could I be flying?
could you be flying?
could he be flying?
could we be flying?
could you be flying?
could they be flying? 	could I have flown?
could you have flown?
could he have flown?
could we have flown?
could you have flown?
could they have flown? 	could I have been flying?
could you have been flying?
could he have been flying?
could we have been flying?
could you have been flying?
could they have been flying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I fly?
couldn't you fly?
couldn't he fly?
couldn't we fly?
couldn't you fly?
couldn't they fly? 	couldn't I be flying?
couldn't you be flying?
couldn't he be flying?
couldn't we be flying?
couldn't you be flying?
couldn't they be flying? 	couldn't I have flown?
couldn't you have flown?
couldn't he have flown?
couldn't we have flown?
couldn't you have flown?
couldn't they have flown? 	couldn't I have been flying?
couldn't you have been flying?
couldn't he have been flying?
couldn't we have been flying?
couldn't you have been flying?
couldn't they have been flying?