could yard
Regular verb: yard - yarded- yarded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could yard
you could yard
she could yard
we could yard
you could yard
they could yard 	I could be yarding
you could be yarding
she could be yarding
we could be yarding
you could be yarding
they could be yarding	I could have yarded
you could have yarded
she could have yarded
we could have yarded
you could have yarded
they could have yarded	I could have been yarding
you could have been yarding
she could have been yarding
we could have been yarding
you could have been yarding
they could have been yarding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not yard
you could not yard
she could not yard
we could not yard
you could not yard
they could not yard 	I could not be yarding
you could not be yarding
she could not be yarding
we could not be yarding
you could not be yarding
they could not be yarding	I could not have yarded
you could not have yarded
she could not have yarded
we could not have yarded
you could not have yarded
they could not have yarded	I could not have been yarding
you could not have been yarding
she could not have been yarding
we could not have been yarding
you could not have been yarding
they could not have been yarding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I yard?
could you yard?
could she yard?
could we yard?
could you yard?
could they yard? 	could I be yarding?
could you be yarding?
could she be yarding?
could we be yarding?
could you be yarding?
could they be yarding? 	could I have yarded?
could you have yarded?
could she have yarded?
could we have yarded?
could you have yarded?
could they have yarded? 	could I have been yarding?
could you have been yarding?
could she have been yarding?
could we have been yarding?
could you have been yarding?
could they have been yarding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not yard?
could you not yard?
could she not yard?
could we not yard?
could you not yard?
could they not yard? 	could I not be yarding?
could you not be yarding?
could she not be yarding?
could we not be yarding?
could you not be yarding?
could they not be yarding? 	could I not have yarded?
could you not have yarded?
could she not have yarded?
could we not have yarded?
could you not have yarded?
could they not have yarded? 	could I not have been yarding?
could you not have been yarding?
could she not have been yarding?
could we not have been yarding?
could you not have been yarding?
could they not have been yarding?