English verb conjugation
COULD DELVE

Regular verb: delve - delved - delved

Affirmation

Simple form	V-ing form
I could delve you could delve she could delve we could delve you could delve they could delve	I could be delving you could be delving she 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 she 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 she 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 she 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 she 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 she 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 she 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 she delve? could we delve? could you delve? could they delve?	could I be delving? could you be delving? could she 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 she 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 she 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 she 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 she 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 she 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 she have been delving? couldn't we have been delving? couldn't you have been delving? couldn't they have been delving?