I must obligate you must obligate he must obligate we must obligate you must obligate they must obligate
V-ing form
I must be obligating you must be obligating he must be obligating we must be obligating you must be obligating they must be obligating
Perfect
I must have obligated you must have obligated he must have obligated we must have obligated you must have obligated they must have obligated
V-ing perfect
I must have been obligating you must have been obligating he must have been obligating we must have been obligating you must have been obligating they must have been obligating
Negation
Simple form
I mustn't obligate you mustn't obligate he mustn't obligate we mustn't obligate you mustn't obligate they mustn't obligate
V-ing form
I mustn't be obligating you mustn't be obligating he mustn't be obligating we mustn't be obligating you mustn't be obligating they mustn't be obligating
Perfect
I mustn't have obligated you mustn't have obligated he mustn't have obligated we mustn't have obligated you mustn't have obligated they mustn't have obligated
V-ing perfect
I mustn't have been obligating you mustn't have been obligating he mustn't have been obligating we mustn't have been obligating you mustn't have been obligating they mustn't have been obligating
Interrogative form
Simple form
must I obligate? must you obligate? must he obligate? must we obligate? must you obligate? must they obligate?
V-ing form
must I be obligating? must you be obligating? must he be obligating? must we be obligating? must you be obligating? must they be obligating?
Perfect
must I have obligated? must you have obligated? must he have obligated? must we have obligated? must you have obligated? must they have obligated?
V-ing perfect
must I have been obligating? must you have been obligating? must he have been obligating? must we have been obligating? must you have been obligating? must they have been obligating?
Interro-negative form
Simple form
mustn't I obligate? mustn't you obligate? mustn't he obligate? mustn't we obligate? mustn't you obligate? mustn't they obligate?
V-ing form
mustn't I be obligating? mustn't you be obligating? mustn't he be obligating? mustn't we be obligating? mustn't you be obligating? mustn't they be obligating?
Perfect
mustn't I have obligated? mustn't you have obligated? mustn't he have obligated? mustn't we have obligated? mustn't you have obligated? mustn't they have obligated?
V-ing perfect
mustn't I have been obligating? mustn't you have been obligating? mustn't he have been obligating? mustn't we have been obligating? mustn't you have been obligating? mustn't they have been obligating?