must lasso
Regular verb: lasso - lassoed- lassoed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must lasso
you must lasso
she must lasso
we must lasso
you must lasso
they must lasso 	I must be lassoing
you must be lassoing
she must be lassoing
we must be lassoing
you must be lassoing
they must be lassoing	I must have lassoed
you must have lassoed
she must have lassoed
we must have lassoed
you must have lassoed
they must have lassoed	I must have been lassoing
you must have been lassoing
she must have been lassoing
we must have been lassoing
you must have been lassoing
they must have been lassoing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't lasso
you mustn't lasso
she mustn't lasso
we mustn't lasso
you mustn't lasso
they mustn't lasso 	I mustn't be lassoing
you mustn't be lassoing
she mustn't be lassoing
we mustn't be lassoing
you mustn't be lassoing
they mustn't be lassoing	I mustn't have lassoed
you mustn't have lassoed
she mustn't have lassoed
we mustn't have lassoed
you mustn't have lassoed
they mustn't have lassoed	I mustn't have been lassoing
you mustn't have been lassoing
she mustn't have been lassoing
we mustn't have been lassoing
you mustn't have been lassoing
they mustn't have been lassoing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I lasso?
must you lasso?
must she lasso?
must we lasso?
must you lasso?
must they lasso? 	must I be lassoing?
must you be lassoing?
must she be lassoing?
must we be lassoing?
must you be lassoing?
must they be lassoing? 	must I have lassoed?
must you have lassoed?
must she have lassoed?
must we have lassoed?
must you have lassoed?
must they have lassoed? 	must I have been lassoing?
must you have been lassoing?
must she have been lassoing?
must we have been lassoing?
must you have been lassoing?
must they have been lassoing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I lasso?
mustn't you lasso?
mustn't she lasso?
mustn't we lasso?
mustn't you lasso?
mustn't they lasso? 	mustn't I be lassoing?
mustn't you be lassoing?
mustn't she be lassoing?
mustn't we be lassoing?
mustn't you be lassoing?
mustn't they be lassoing? 	mustn't I have lassoed?
mustn't you have lassoed?
mustn't she have lassoed?
mustn't we have lassoed?
mustn't you have lassoed?
mustn't they have lassoed? 	mustn't I have been lassoing?
mustn't you have been lassoing?
mustn't she have been lassoing?
mustn't we have been lassoing?
mustn't you have been lassoing?
mustn't they have been lassoing?