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