I can serge you can serge she can serge we can serge you can serge they can serge
V-ing form
I can be serging you can be serging she can be serging we can be serging you can be serging they can be serging
Perfect
I can have serged you can have serged she can have serged we can have serged you can have serged they can have serged
V-ing perfect
I can have been serging you can have been serging she can have been serging we can have been serging you can have been serging they can have been serging
Negation
Simple form
I cannot serge you cannot serge she cannot serge we cannot serge you cannot serge they cannot serge
V-ing form
I cannot be serging you cannot be serging she cannot be serging we cannot be serging you cannot be serging they cannot be serging
Perfect
I cannot have serged you cannot have serged she cannot have serged we cannot have serged you cannot have serged they cannot have serged
V-ing perfect
I cannot have been serging you cannot have been serging she cannot have been serging we cannot have been serging you cannot have been serging they cannot have been serging
Interrogative form
Simple form
can I serge? can you serge? can she serge? can we serge? can you serge? can they serge?
V-ing form
can I be serging? can you be serging? can she be serging? can we be serging? can you be serging? can they be serging?
Perfect
can I have serged? can you have serged? can she have serged? can we have serged? can you have serged? can they have serged?
V-ing perfect
can I have been serging? can you have been serging? can she have been serging? can we have been serging? can you have been serging? can they have been serging?
Interro-negative form
Simple form
can I not serge? can you not serge? can she not serge? can we not serge? can you not serge? can they not serge?
V-ing form
can I not be serging? can you not be serging? can she not be serging? can we not be serging? can you not be serging? can they not be serging?
Perfect
can I not have serged? can you not have serged? can she not have serged? can we not have serged? can you not have serged? can they not have serged?
V-ing perfect
can I not have been serging? can you not have been serging? can she not have been serging? can we not have been serging? can you not have been serging? can they not have been serging?