English verb conjugation
MUST WHIR

Regular verb: whir - whired - whired

Affirmation

Simple form	V-ing form
I must whir you must whir he must whir we must whir you must whir they must whir	I must be whiring you must be whiring he must be whiring we must be whiring you must be whiring they must be whiring
Perfect	V-ing perfect
I must have whired you must have whired he must have whired we must have whired you must have whired they must have whired	I must have been whiring you must have been whiring he must have been whiring we must have been whiring you must have been whiring they must have been whiring

Negation

Simple form	V-ing form
I mustn't whir you mustn't whir he mustn't whir we mustn't whir you mustn't whir they mustn't whir	I mustn't be whiring you mustn't be whiring he mustn't be whiring we mustn't be whiring you mustn't be whiring they mustn't be whiring
Perfect	V-ing perfect
I mustn't have whired you mustn't have whired he mustn't have whired we mustn't have whired you mustn't have whired they mustn't have whired	I mustn't have been whiring you mustn't have been whiring he mustn't have been whiring we mustn't have been whiring you mustn't have been whiring they mustn't have been whiring

Interrogative form

Simple form	V-ing form
must I whir? must you whir? must he whir? must we whir? must you whir? must they whir?	must I be whiring? must you be whiring? must he be whiring? must we be whiring? must you be whiring? must they be whiring?
Perfect	V-ing perfect
must I have whired? must you have whired? must he have whired? must we have whired? must you have whired? must they have whired?	must I have been whiring? must you have been whiring? must he have been whiring? must we have been whiring? must you have been whiring? must they have been whiring?

Interro-negative form

Simple form	V-ing form
mustn't I whir? mustn't you whir? mustn't he whir? mustn't we whir? mustn't you whir? mustn't they whir?	mustn't I be whiring? mustn't you be whiring? mustn't he be whiring? mustn't we be whiring? mustn't you be whiring? mustn't they be whiring?
Perfect	V-ing perfect
mustn't I have whired? mustn't you have whired? mustn't he have whired? mustn't we have whired? mustn't you have whired? mustn't they have whired?	mustn't I have been whiring? mustn't you have been whiring? mustn't he have been whiring? mustn't we have been whiring? mustn't you have been whiring? mustn't they have been whiring?