I can watchdog you can watchdog she can watchdog we can watchdog you can watchdog they can watchdog
V-ing form
I can be watchdoging you can be watchdoging she can be watchdoging we can be watchdoging you can be watchdoging they can be watchdoging
Perfect
I can have watchdoged you can have watchdoged she can have watchdoged we can have watchdoged you can have watchdoged they can have watchdoged
V-ing perfect
I can have been watchdoging you can have been watchdoging she can have been watchdoging we can have been watchdoging you can have been watchdoging they can have been watchdoging
Negation
Simple form
I cannot watchdog you cannot watchdog she cannot watchdog we cannot watchdog you cannot watchdog they cannot watchdog
V-ing form
I cannot be watchdoging you cannot be watchdoging she cannot be watchdoging we cannot be watchdoging you cannot be watchdoging they cannot be watchdoging
Perfect
I cannot have watchdoged you cannot have watchdoged she cannot have watchdoged we cannot have watchdoged you cannot have watchdoged they cannot have watchdoged
V-ing perfect
I cannot have been watchdoging you cannot have been watchdoging she cannot have been watchdoging we cannot have been watchdoging you cannot have been watchdoging they cannot have been watchdoging
Interrogative form
Simple form
can I watchdog? can you watchdog? can she watchdog? can we watchdog? can you watchdog? can they watchdog?
V-ing form
can I be watchdoging? can you be watchdoging? can she be watchdoging? can we be watchdoging? can you be watchdoging? can they be watchdoging?
Perfect
can I have watchdoged? can you have watchdoged? can she have watchdoged? can we have watchdoged? can you have watchdoged? can they have watchdoged?
V-ing perfect
can I have been watchdoging? can you have been watchdoging? can she have been watchdoging? can we have been watchdoging? can you have been watchdoging? can they have been watchdoging?
Interro-negative form
Simple form
can I not watchdog? can you not watchdog? can she not watchdog? can we not watchdog? can you not watchdog? can they not watchdog?
V-ing form
can I not be watchdoging? can you not be watchdoging? can she not be watchdoging? can we not be watchdoging? can you not be watchdoging? can they not be watchdoging?
Perfect
can I not have watchdoged? can you not have watchdoged? can she not have watchdoged? can we not have watchdoged? can you not have watchdoged? can they not have watchdoged?
V-ing perfect
can I not have been watchdoging? can you not have been watchdoging? can she not have been watchdoging? can we not have been watchdoging? can you not have been watchdoging? can they not have been watchdoging?