I can dredge you can dredge she can dredge we can dredge you can dredge they can dredge
V-ing form
I can be dredging you can be dredging she can be dredging we can be dredging you can be dredging they can be dredging
Perfect
I can have dredged you can have dredged she can have dredged we can have dredged you can have dredged they can have dredged
V-ing perfect
I can have been dredging you can have been dredging she can have been dredging we can have been dredging you can have been dredging they can have been dredging
Negation
Simple form
I cannot dredge you cannot dredge she cannot dredge we cannot dredge you cannot dredge they cannot dredge
V-ing form
I cannot be dredging you cannot be dredging she cannot be dredging we cannot be dredging you cannot be dredging they cannot be dredging
Perfect
I cannot have dredged you cannot have dredged she cannot have dredged we cannot have dredged you cannot have dredged they cannot have dredged
V-ing perfect
I cannot have been dredging you cannot have been dredging she cannot have been dredging we cannot have been dredging you cannot have been dredging they cannot have been dredging
Interrogative form
Simple form
can I dredge? can you dredge? can she dredge? can we dredge? can you dredge? can they dredge?
V-ing form
can I be dredging? can you be dredging? can she be dredging? can we be dredging? can you be dredging? can they be dredging?
Perfect
can I have dredged? can you have dredged? can she have dredged? can we have dredged? can you have dredged? can they have dredged?
V-ing perfect
can I have been dredging? can you have been dredging? can she have been dredging? can we have been dredging? can you have been dredging? can they have been dredging?
Interro-negative form
Simple form
can I not dredge? can you not dredge? can she not dredge? can we not dredge? can you not dredge? can they not dredge?
V-ing form
can I not be dredging? can you not be dredging? can she not be dredging? can we not be dredging? can you not be dredging? can they not be dredging?
Perfect
can I not have dredged? can you not have dredged? can she not have dredged? can we not have dredged? can you not have dredged? can they not have dredged?
V-ing perfect
can I not have been dredging? can you not have been dredging? can she not have been dredging? can we not have been dredging? can you not have been dredging? can they not have been dredging?