could delve
Regular verb: delve - delved- delved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?