I can delve you can delve he can delve we can delve you can delve they can delve
V-ing form
I can be delving you can be delving he can be delving we can be delving you can be delving they can be delving
Perfect
I can have delved you can have delved he can have delved we can have delved you can have delved they can have delved
V-ing perfect
I can have been delving you can have been delving he can have been delving we can have been delving you can have been delving they can have been delving
Negation
Simple form
I can't delve you can't delve he can't delve we can't delve you can't delve they can't delve
V-ing form
I can't be delving you can't be delving he can't be delving we can't be delving you can't be delving they can't be delving
Perfect
I can't have delved you can't have delved he can't have delved we can't have delved you can't have delved they can't have delved
V-ing perfect
I can't have been delving you can't have been delving he can't have been delving we can't have been delving you can't have been delving they can't have been delving
Interrogative form
Simple form
can I delve? can you delve? can he delve? can we delve? can you delve? can they delve?
V-ing form
can I be delving? can you be delving? can he be delving? can we be delving? can you be delving? can they be delving?
Perfect
can I have delved? can you have delved? can he have delved? can we have delved? can you have delved? can they have delved?
V-ing perfect
can I have been delving? can you have been delving? can he have been delving? can we have been delving? can you have been delving? can they have been delving?
Interro-negative form
Simple form
can't I delve? can't you delve? can't he delve? can't we delve? can't you delve? can't they delve?
V-ing form
can't I be delving? can't you be delving? can't he be delving? can't we be delving? can't you be delving? can't they be delving?
Perfect
can't I have delved? can't you have delved? can't he have delved? can't we have delved? can't you have delved? can't they have delved?
V-ing perfect
can't I have been delving? can't you have been delving? can't he have been delving? can't we have been delving? can't you have been delving? can't they have been delving?