must span
Regular verb: span - spanned- spanned

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

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

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

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