English verb conjugation
MUST LAG

Regular verb: lag - lagged - lagged

Affirmation

Simple form	V-ing form
I must lag you must lag he must lag we must lag you must lag they must lag	I must be lagging you must be lagging he must be lagging we must be lagging you must be lagging they must be lagging
Perfect	V-ing perfect
I must have lagged you must have lagged he must have lagged we must have lagged you must have lagged they must have lagged	I must have been lagging you must have been lagging he must have been lagging we must have been lagging you must have been lagging they must have been lagging

Negation

Simple form	V-ing form
I must not lag you must not lag he must not lag we must not lag you must not lag they must not lag	I must not be lagging you must not be lagging he must not be lagging we must not be lagging you must not be lagging they must not be lagging
Perfect	V-ing perfect
I must not have lagged you must not have lagged he must not have lagged we must not have lagged you must not have lagged they must not have lagged	I must not have been lagging you must not have been lagging he must not have been lagging we must not have been lagging you must not have been lagging they must not have been lagging

Interrogative form

Simple form	V-ing form
must I lag? must you lag? must he lag? must we lag? must you lag? must they lag?	must I be lagging? must you be lagging? must he be lagging? must we be lagging? must you be lagging? must they be lagging?
Perfect	V-ing perfect
must I have lagged? must you have lagged? must he have lagged? must we have lagged? must you have lagged? must they have lagged?	must I have been lagging? must you have been lagging? must he have been lagging? must we have been lagging? must you have been lagging? must they have been lagging?

Interro-negative form

Simple form	V-ing form
must I not lag? must you not lag? must he not lag? must we not lag? must you not lag? must they not lag?	must I not be lagging? must you not be lagging? must he not be lagging? must we not be lagging? must you not be lagging? must they not be lagging?
Perfect	V-ing perfect
must I not have lagged? must you not have lagged? must he not have lagged? must we not have lagged? must you not have lagged? must they not have lagged?	must I not have been lagging? must you not have been lagging? must he not have been lagging? must we not have been lagging? must you not have been lagging? must they not have been lagging?