could dig
Irregular verb: dig - dug- dug

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dig
you could dig
he could dig
we could dig
you could dig
they could dig 	I could be digging
you could be digging
he could be digging
we could be digging
you could be digging
they could be digging	I could have dug
you could have dug
he could have dug
we could have dug
you could have dug
they could have dug	I could have been digging
you could have been digging
he could have been digging
we could have been digging
you could have been digging
they could have been digging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not dig
you could not dig
he could not dig
we could not dig
you could not dig
they could not dig 	I could not be digging
you could not be digging
he could not be digging
we could not be digging
you could not be digging
they could not be digging	I could not have dug
you could not have dug
he could not have dug
we could not have dug
you could not have dug
they could not have dug	I could not have been digging
you could not have been digging
he could not have been digging
we could not have been digging
you could not have been digging
they could not have been digging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dig?
could you dig?
could he dig?
could we dig?
could you dig?
could they dig? 	could I be digging?
could you be digging?
could he be digging?
could we be digging?
could you be digging?
could they be digging? 	could I have dug?
could you have dug?
could he have dug?
could we have dug?
could you have dug?
could they have dug? 	could I have been digging?
could you have been digging?
could he have been digging?
could we have been digging?
could you have been digging?
could they have been digging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not dig?
could you not dig?
could he not dig?
could we not dig?
could you not dig?
could they not dig? 	could I not be digging?
could you not be digging?
could he not be digging?
could we not be digging?
could you not be digging?
could they not be digging? 	could I not have dug?
could you not have dug?
could he not have dug?
could we not have dug?
could you not have dug?
could they not have dug? 	could I not have been digging?
could you not have been digging?
could he not have been digging?
could we not have been digging?
could you not have been digging?
could they not have been digging?