I must attire you must attire she must attire we must attire you must attire they must attire
V-ing form
I must be attiring you must be attiring she must be attiring we must be attiring you must be attiring they must be attiring
Perfect
I must have attired you must have attired she must have attired we must have attired you must have attired they must have attired
V-ing perfect
I must have been attiring you must have been attiring she must have been attiring we must have been attiring you must have been attiring they must have been attiring
Negation
Simple form
I must not attire you must not attire she must not attire we must not attire you must not attire they must not attire
V-ing form
I must not be attiring you must not be attiring she must not be attiring we must not be attiring you must not be attiring they must not be attiring
Perfect
I must not have attired you must not have attired she must not have attired we must not have attired you must not have attired they must not have attired
V-ing perfect
I must not have been attiring you must not have been attiring she must not have been attiring we must not have been attiring you must not have been attiring they must not have been attiring
Interrogative form
Simple form
must I attire? must you attire? must she attire? must we attire? must you attire? must they attire?
V-ing form
must I be attiring? must you be attiring? must she be attiring? must we be attiring? must you be attiring? must they be attiring?
Perfect
must I have attired? must you have attired? must she have attired? must we have attired? must you have attired? must they have attired?
V-ing perfect
must I have been attiring? must you have been attiring? must she have been attiring? must we have been attiring? must you have been attiring? must they have been attiring?
Interro-negative form
Simple form
must I not attire? must you not attire? must she not attire? must we not attire? must you not attire? must they not attire?
V-ing form
must I not be attiring? must you not be attiring? must she not be attiring? must we not be attiring? must you not be attiring? must they not be attiring?
Perfect
must I not have attired? must you not have attired? must she not have attired? must we not have attired? must you not have attired? must they not have attired?
V-ing perfect
must I not have been attiring? must you not have been attiring? must she not have been attiring? must we not have been attiring? must you not have been attiring? must they not have been attiring?