English verb conjugation
COULD DELVE

Regular verb: delve - delved - delved

Affirmation

Simple form	V-ing form
I could delve you could delve he could delve we could delve you could delve they could delve	I could be delving you could be delving he could be delving we could be delving you could be delving they could be delving
Perfect	V-ing perfect
I could have delved you could have delved he could have delved we could have delved you could have delved they could have delved	I could have been delving you could have been delving he could have been delving we could have been delving you could have been delving they could have been delving

Negation

Simple form	V-ing form
I couldn't delve you couldn't delve he couldn't delve we couldn't delve you couldn't delve they couldn't delve	I couldn't be delving you couldn't be delving he couldn't be delving we couldn't be delving you couldn't be delving they couldn't be delving
Perfect	V-ing perfect
I couldn't have delved you couldn't have delved he couldn't have delved we couldn't have delved you couldn't have delved they couldn't have delved	I couldn't have been delving you couldn't have been delving he couldn't have been delving we couldn't have been delving you couldn't have been delving they couldn't have been delving

Interrogative form

Simple form	V-ing form
could I delve? could you delve? could he delve? could we delve? could you delve? could they delve?	could I be delving? could you be delving? could he be delving? could we be delving? could you be delving? could they be delving?
Perfect	V-ing perfect
could I have delved? could you have delved? could he have delved? could we have delved? could you have delved? could they have delved?	could I have been delving? could you have been delving? could he have been delving? could we have been delving? could you have been delving? could they have been delving?

Interro-negative form

Simple form	V-ing form
couldn't I delve? couldn't you delve? couldn't he delve? couldn't we delve? couldn't you delve? couldn't they delve?	couldn't I be delving? couldn't you be delving? couldn't he be delving? couldn't we be delving? couldn't you be delving? couldn't they be delving?
Perfect	V-ing perfect
couldn't I have delved? couldn't you have delved? couldn't he have delved? couldn't we have delved? couldn't you have delved? couldn't they have delved?	couldn't I have been delving? couldn't you have been delving? couldn't he have been delving? couldn't we have been delving? couldn't you have been delving? couldn't they have been delving?