could crud
Regular verb: crud - cruded- cruded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could crud
you could crud
he could crud
we could crud
you could crud
they could crud 	I could be cruding
you could be cruding
he could be cruding
we could be cruding
you could be cruding
they could be cruding	I could have cruded
you could have cruded
he could have cruded
we could have cruded
you could have cruded
they could have cruded	I could have been cruding
you could have been cruding
he could have been cruding
we could have been cruding
you could have been cruding
they could have been cruding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not crud
you could not crud
he could not crud
we could not crud
you could not crud
they could not crud 	I could not be cruding
you could not be cruding
he could not be cruding
we could not be cruding
you could not be cruding
they could not be cruding	I could not have cruded
you could not have cruded
he could not have cruded
we could not have cruded
you could not have cruded
they could not have cruded	I could not have been cruding
you could not have been cruding
he could not have been cruding
we could not have been cruding
you could not have been cruding
they could not have been cruding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I crud?
could you crud?
could he crud?
could we crud?
could you crud?
could they crud? 	could I be cruding?
could you be cruding?
could he be cruding?
could we be cruding?
could you be cruding?
could they be cruding? 	could I have cruded?
could you have cruded?
could he have cruded?
could we have cruded?
could you have cruded?
could they have cruded? 	could I have been cruding?
could you have been cruding?
could he have been cruding?
could we have been cruding?
could you have been cruding?
could they have been cruding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not crud?
could you not crud?
could he not crud?
could we not crud?
could you not crud?
could they not crud? 	could I not be cruding?
could you not be cruding?
could he not be cruding?
could we not be cruding?
could you not be cruding?
could they not be cruding? 	could I not have cruded?
could you not have cruded?
could he not have cruded?
could we not have cruded?
could you not have cruded?
could they not have cruded? 	could I not have been cruding?
could you not have been cruding?
could he not have been cruding?
could we not have been cruding?
could you not have been cruding?
could they not have been cruding?