could span
Regular verb: span - spanned- spanned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could span
you could span
he could span
we could span
you could span
they could span 	I could be spanning
you could be spanning
he could be spanning
we could be spanning
you could be spanning
they could be spanning	I could have spanned
you could have spanned
he could have spanned
we could have spanned
you could have spanned
they could have spanned	I could have been spanning
you could have been spanning
he could have been spanning
we could have been spanning
you could have been spanning
they could have been spanning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not span
you could not span
he could not span
we could not span
you could not span
they could not span 	I could not be spanning
you could not be spanning
he could not be spanning
we could not be spanning
you could not be spanning
they could not be spanning	I could not have spanned
you could not have spanned
he could not have spanned
we could not have spanned
you could not have spanned
they could not have spanned	I could not have been spanning
you could not have been spanning
he could not have been spanning
we could not have been spanning
you could not have been spanning
they could not have been spanning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I span?
could you span?
could he span?
could we span?
could you span?
could they span? 	could I be spanning?
could you be spanning?
could he be spanning?
could we be spanning?
could you be spanning?
could they be spanning? 	could I have spanned?
could you have spanned?
could he have spanned?
could we have spanned?
could you have spanned?
could they have spanned? 	could I have been spanning?
could you have been spanning?
could he have been spanning?
could we have been spanning?
could you have been spanning?
could they have been spanning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not span?
could you not span?
could he not span?
could we not span?
could you not span?
could they not span? 	could I not be spanning?
could you not be spanning?
could he not be spanning?
could we not be spanning?
could you not be spanning?
could they not be spanning? 	could I not have spanned?
could you not have spanned?
could he not have spanned?
could we not have spanned?
could you not have spanned?
could they not have spanned? 	could I not have been spanning?
could you not have been spanning?
could he not have been spanning?
could we not have been spanning?
could you not have been spanning?
could they not have been spanning?