English verb conjugation
CAN SAP

Regular verb: sap - sapped - sapped

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not sap? can you not sap? can he not sap? can we not sap? can you not sap? can they not sap?	can I not be sapping? can you not be sapping? can he not be sapping? can we not be sapping? can you not be sapping? can they not be sapping?
Perfect	V-ing perfect
can I not have sapped? can you not have sapped? can he not have sapped? can we not have sapped? can you not have sapped? can they not have sapped?	can I not have been sapping? can you not have been sapping? can he not have been sapping? can we not have been sapping? can you not have been sapping? can they not have been sapping?