English verb conjugation
COULD NAG

Regular verb: nag - nagged - nagged

Affirmation

Simple form	V-ing form
I could nag you could nag he could nag we could nag you could nag they could nag	I could be nagging you could be nagging he could be nagging we could be nagging you could be nagging they could be nagging
Perfect	V-ing perfect
I could have nagged you could have nagged he could have nagged we could have nagged you could have nagged they could have nagged	I could have been nagging you could have been nagging he could have been nagging we could have been nagging you could have been nagging they could have been nagging

Negation

Simple form	V-ing form
I couldn't nag you couldn't nag he couldn't nag we couldn't nag you couldn't nag they couldn't nag	I couldn't be nagging you couldn't be nagging he couldn't be nagging we couldn't be nagging you couldn't be nagging they couldn't be nagging
Perfect	V-ing perfect
I couldn't have nagged you couldn't have nagged he couldn't have nagged we couldn't have nagged you couldn't have nagged they couldn't have nagged	I couldn't have been nagging you couldn't have been nagging he couldn't have been nagging we couldn't have been nagging you couldn't have been nagging they couldn't have been nagging

Interrogative form

Simple form	V-ing form
could I nag? could you nag? could he nag? could we nag? could you nag? could they nag?	could I be nagging? could you be nagging? could he be nagging? could we be nagging? could you be nagging? could they be nagging?
Perfect	V-ing perfect
could I have nagged? could you have nagged? could he have nagged? could we have nagged? could you have nagged? could they have nagged?	could I have been nagging? could you have been nagging? could he have been nagging? could we have been nagging? could you have been nagging? could they have been nagging?

Interro-negative form

Simple form	V-ing form
couldn't I nag? couldn't you nag? couldn't he nag? couldn't we nag? couldn't you nag? couldn't they nag?	couldn't I be nagging? couldn't you be nagging? couldn't he be nagging? couldn't we be nagging? couldn't you be nagging? couldn't they be nagging?
Perfect	V-ing perfect
couldn't I have nagged? couldn't you have nagged? couldn't he have nagged? couldn't we have nagged? couldn't you have nagged? couldn't they have nagged?	couldn't I have been nagging? couldn't you have been nagging? couldn't he have been nagging? couldn't we have been nagging? couldn't you have been nagging? couldn't they have been nagging?