I can serge you can serge he can serge we can serge you can serge they can serge
V-ing form
I can be serging you can be serging he can be serging we can be serging you can be serging they can be serging
Perfect
I can have serged you can have serged he 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 he can have been serging we can have been serging you can have been serging they can have been serging
Negation
Simple form
I can't serge you can't serge he can't serge we can't serge you can't serge they can't serge
V-ing form
I can't be serging you can't be serging he can't be serging we can't be serging you can't be serging they can't be serging
Perfect
I can't have serged you can't have serged he can't have serged we can't have serged you can't have serged they can't have serged
V-ing perfect
I can't have been serging you can't have been serging he can't have been serging we can't have been serging you can't have been serging they can't have been serging
Interrogative form
Simple form
can I serge? can you serge? can he serge? can we serge? can you serge? can they serge?
V-ing form
can I be serging? can you be serging? can he be serging? can we be serging? can you be serging? can they be serging?
Perfect
can I have serged? can you have serged? can he 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 he have been serging? can we have been serging? can you have been serging? can they have been serging?
Interro-negative form
Simple form
can't I serge? can't you serge? can't he serge? can't we serge? can't you serge? can't they serge?
V-ing form
can't I be serging? can't you be serging? can't he be serging? can't we be serging? can't you be serging? can't they be serging?
Perfect
can't I have serged? can't you have serged? can't he have serged? can't we have serged? can't you have serged? can't they have serged?
V-ing perfect
can't I have been serging? can't you have been serging? can't he have been serging? can't we have been serging? can't you have been serging? can't they have been serging?