English verb conjugation
CAN FLAG

Regular verb: flag - flagged - flagged

Affirmation

Simple form	V-ing form
I can flag you can flag he can flag we can flag you can flag they can flag	I can be flagging you can be flagging he can be flagging we can be flagging you can be flagging they can be flagging
Perfect	V-ing perfect
I can have flagged you can have flagged he can have flagged we can have flagged you can have flagged they can have flagged	I can have been flagging you can have been flagging he can have been flagging we can have been flagging you can have been flagging they can have been flagging

Negation

Simple form	V-ing form
I can't flag you can't flag he can't flag we can't flag you can't flag they can't flag	I can't be flagging you can't be flagging he can't be flagging we can't be flagging you can't be flagging they can't be flagging
Perfect	V-ing perfect
I can't have flagged you can't have flagged he can't have flagged we can't have flagged you can't have flagged they can't have flagged	I can't have been flagging you can't have been flagging he can't have been flagging we can't have been flagging you can't have been flagging they can't have been flagging

Interrogative form

Simple form	V-ing form
can I flag? can you flag? can he flag? can we flag? can you flag? can they flag?	can I be flagging? can you be flagging? can he be flagging? can we be flagging? can you be flagging? can they be flagging?
Perfect	V-ing perfect
can I have flagged? can you have flagged? can he have flagged? can we have flagged? can you have flagged? can they have flagged?	can I have been flagging? can you have been flagging? can he have been flagging? can we have been flagging? can you have been flagging? can they have been flagging?

Interro-negative form

Simple form	V-ing form
can't I flag? can't you flag? can't he flag? can't we flag? can't you flag? can't they flag?	can't I be flagging? can't you be flagging? can't he be flagging? can't we be flagging? can't you be flagging? can't they be flagging?
Perfect	V-ing perfect
can't I have flagged? can't you have flagged? can't he have flagged? can't we have flagged? can't you have flagged? can't they have flagged?	can't I have been flagging? can't you have been flagging? can't he have been flagging? can't we have been flagging? can't you have been flagging? can't they have been flagging?