could silk
Regular verb: silk - silked- silked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could silk
you could silk
she could silk
we could silk
you could silk
they could silk 	I could be silking
you could be silking
she could be silking
we could be silking
you could be silking
they could be silking	I could have silked
you could have silked
she could have silked
we could have silked
you could have silked
they could have silked	I could have been silking
you could have been silking
she could have been silking
we could have been silking
you could have been silking
they could have been silking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not silk
you could not silk
she could not silk
we could not silk
you could not silk
they could not silk 	I could not be silking
you could not be silking
she could not be silking
we could not be silking
you could not be silking
they could not be silking	I could not have silked
you could not have silked
she could not have silked
we could not have silked
you could not have silked
they could not have silked	I could not have been silking
you could not have been silking
she could not have been silking
we could not have been silking
you could not have been silking
they could not have been silking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I silk?
could you silk?
could she silk?
could we silk?
could you silk?
could they silk? 	could I be silking?
could you be silking?
could she be silking?
could we be silking?
could you be silking?
could they be silking? 	could I have silked?
could you have silked?
could she have silked?
could we have silked?
could you have silked?
could they have silked? 	could I have been silking?
could you have been silking?
could she have been silking?
could we have been silking?
could you have been silking?
could they have been silking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not silk?
could you not silk?
could she not silk?
could we not silk?
could you not silk?
could they not silk? 	could I not be silking?
could you not be silking?
could she not be silking?
could we not be silking?
could you not be silking?
could they not be silking? 	could I not have silked?
could you not have silked?
could she not have silked?
could we not have silked?
could you not have silked?
could they not have silked? 	could I not have been silking?
could you not have been silking?
could she not have been silking?
could we not have been silking?
could you not have been silking?
could they not have been silking?