must attain
Regular verb: attain - attained- attained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must attain
you must attain
she must attain
we must attain
you must attain
they must attain 	I must be attaining
you must be attaining
she must be attaining
we must be attaining
you must be attaining
they must be attaining	I must have attained
you must have attained
she must have attained
we must have attained
you must have attained
they must have attained	I must have been attaining
you must have been attaining
she must have been attaining
we must have been attaining
you must have been attaining
they must have been attaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't attain
you mustn't attain
she mustn't attain
we mustn't attain
you mustn't attain
they mustn't attain 	I mustn't be attaining
you mustn't be attaining
she mustn't be attaining
we mustn't be attaining
you mustn't be attaining
they mustn't be attaining	I mustn't have attained
you mustn't have attained
she mustn't have attained
we mustn't have attained
you mustn't have attained
they mustn't have attained	I mustn't have been attaining
you mustn't have been attaining
she mustn't have been attaining
we mustn't have been attaining
you mustn't have been attaining
they mustn't have been attaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I attain?
must you attain?
must she attain?
must we attain?
must you attain?
must they attain? 	must I be attaining?
must you be attaining?
must she be attaining?
must we be attaining?
must you be attaining?
must they be attaining? 	must I have attained?
must you have attained?
must she have attained?
must we have attained?
must you have attained?
must they have attained? 	must I have been attaining?
must you have been attaining?
must she have been attaining?
must we have been attaining?
must you have been attaining?
must they have been attaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I attain?
mustn't you attain?
mustn't she attain?
mustn't we attain?
mustn't you attain?
mustn't they attain? 	mustn't I be attaining?
mustn't you be attaining?
mustn't she be attaining?
mustn't we be attaining?
mustn't you be attaining?
mustn't they be attaining? 	mustn't I have attained?
mustn't you have attained?
mustn't she have attained?
mustn't we have attained?
mustn't you have attained?
mustn't they have attained? 	mustn't I have been attaining?
mustn't you have been attaining?
mustn't she have been attaining?
mustn't we have been attaining?
mustn't you have been attaining?
mustn't they have been attaining?