English verb conjugation
MUST SAG

Regular verb: sag - sagged - sagged

Affirmation

Simple form	V-ing form
I must sag you must sag she must sag we must sag you must sag they must sag	I must be sagging you must be sagging she must be sagging we must be sagging you must be sagging they must be sagging
Perfect	V-ing perfect
I must have sagged you must have sagged she must have sagged we must have sagged you must have sagged they must have sagged	I must have been sagging you must have been sagging she must have been sagging we must have been sagging you must have been sagging they must have been sagging

Negation

Simple form	V-ing form
I mustn't sag you mustn't sag she mustn't sag we mustn't sag you mustn't sag they mustn't sag	I mustn't be sagging you mustn't be sagging she mustn't be sagging we mustn't be sagging you mustn't be sagging they mustn't be sagging
Perfect	V-ing perfect
I mustn't have sagged you mustn't have sagged she mustn't have sagged we mustn't have sagged you mustn't have sagged they mustn't have sagged	I mustn't have been sagging you mustn't have been sagging she mustn't have been sagging we mustn't have been sagging you mustn't have been sagging they mustn't have been sagging

Interrogative form

Simple form	V-ing form
must I sag? must you sag? must she sag? must we sag? must you sag? must they sag?	must I be sagging? must you be sagging? must she be sagging? must we be sagging? must you be sagging? must they be sagging?
Perfect	V-ing perfect
must I have sagged? must you have sagged? must she have sagged? must we have sagged? must you have sagged? must they have sagged?	must I have been sagging? must you have been sagging? must she have been sagging? must we have been sagging? must you have been sagging? must they have been sagging?

Interro-negative form

Simple form	V-ing form
mustn't I sag? mustn't you sag? mustn't she sag? mustn't we sag? mustn't you sag? mustn't they sag?	mustn't I be sagging? mustn't you be sagging? mustn't she be sagging? mustn't we be sagging? mustn't you be sagging? mustn't they be sagging?
Perfect	V-ing perfect
mustn't I have sagged? mustn't you have sagged? mustn't she have sagged? mustn't we have sagged? mustn't you have sagged? mustn't they have sagged?	mustn't I have been sagging? mustn't you have been sagging? mustn't she have been sagging? mustn't we have been sagging? mustn't you have been sagging? mustn't they have been sagging?