English verb conjugation
MUST SAP

Regular verb: sap - sapped - sapped

Affirmation

Simple form	V-ing form
I must sap you must sap he must sap we must sap you must sap they must sap	I must be sapping you must be sapping he must be sapping we must be sapping you must be sapping they must be sapping
Perfect	V-ing perfect
I must have sapped you must have sapped he must have sapped we must have sapped you must have sapped they must have sapped	I must have been sapping you must have been sapping he must have been sapping we must have been sapping you must have been sapping they must have been sapping

Negation

Simple form	V-ing form
I mustn't sap you mustn't sap he mustn't sap we mustn't sap you mustn't sap they mustn't sap	I mustn't be sapping you mustn't be sapping he mustn't be sapping we mustn't be sapping you mustn't be sapping they mustn't be sapping
Perfect	V-ing perfect
I mustn't have sapped you mustn't have sapped he mustn't have sapped we mustn't have sapped you mustn't have sapped they mustn't have sapped	I mustn't have been sapping you mustn't have been sapping he mustn't have been sapping we mustn't have been sapping you mustn't have been sapping they mustn't have been sapping

Interrogative form

Simple form	V-ing form
must I sap? must you sap? must he sap? must we sap? must you sap? must they sap?	must I be sapping? must you be sapping? must he be sapping? must we be sapping? must you be sapping? must they be sapping?
Perfect	V-ing perfect
must I have sapped? must you have sapped? must he have sapped? must we have sapped? must you have sapped? must they have sapped?	must I have been sapping? must you have been sapping? must he have been sapping? must we have been sapping? must you have been sapping? must they have been sapping?

Interro-negative form

Simple form	V-ing form
mustn't I sap? mustn't you sap? mustn't he sap? mustn't we sap? mustn't you sap? mustn't they sap?	mustn't I be sapping? mustn't you be sapping? mustn't he be sapping? mustn't we be sapping? mustn't you be sapping? mustn't they be sapping?
Perfect	V-ing perfect
mustn't I have sapped? mustn't you have sapped? mustn't he have sapped? mustn't we have sapped? mustn't you have sapped? mustn't they have sapped?	mustn't I have been sapping? mustn't you have been sapping? mustn't he have been sapping? mustn't we have been sapping? mustn't you have been sapping? mustn't they have been sapping?