could crook
Regular verb: crook - crooked- crooked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could crook
you could crook
she could crook
we could crook
you could crook
they could crook 	I could be crooking
you could be crooking
she could be crooking
we could be crooking
you could be crooking
they could be crooking	I could have crooked
you could have crooked
she could have crooked
we could have crooked
you could have crooked
they could have crooked	I could have been crooking
you could have been crooking
she could have been crooking
we could have been crooking
you could have been crooking
they could have been crooking	

Negation 	
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I could not crook
you could not crook
she could not crook
we could not crook
you could not crook
they could not crook 	I could not be crooking
you could not be crooking
she could not be crooking
we could not be crooking
you could not be crooking
they could not be crooking	I could not have crooked
you could not have crooked
she could not have crooked
we could not have crooked
you could not have crooked
they could not have crooked	I could not have been crooking
you could not have been crooking
she could not have been crooking
we could not have been crooking
you could not have been crooking
they could not have been crooking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I crook?
could you crook?
could she crook?
could we crook?
could you crook?
could they crook? 	could I be crooking?
could you be crooking?
could she be crooking?
could we be crooking?
could you be crooking?
could they be crooking? 	could I have crooked?
could you have crooked?
could she have crooked?
could we have crooked?
could you have crooked?
could they have crooked? 	could I have been crooking?
could you have been crooking?
could she have been crooking?
could we have been crooking?
could you have been crooking?
could they have been crooking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not crook?
could you not crook?
could she not crook?
could we not crook?
could you not crook?
could they not crook? 	could I not be crooking?
could you not be crooking?
could she not be crooking?
could we not be crooking?
could you not be crooking?
could they not be crooking? 	could I not have crooked?
could you not have crooked?
could she not have crooked?
could we not have crooked?
could you not have crooked?
could they not have crooked? 	could I not have been crooking?
could you not have been crooking?
could she not have been crooking?
could we not have been crooking?
could you not have been crooking?
could they not have been crooking?