English verb conjugation
MUST SAP

Regular verb: sap - sapped - sapped

Affirmation

Simple form	V-ing form
I must sap you must sap she must sap we must sap you must sap they must sap	I must be sapping you must be sapping she 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 she 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 she 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 she 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 she 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 she 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 she 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 she sap? must we sap? must you sap? must they sap?	must I be sapping? must you be sapping? must she 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 she 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 she 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 she 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 she 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 she 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 she have been sapping? mustn't we have been sapping? mustn't you have been sapping? mustn't they have been sapping?