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