English verb conjugation
COULD DUPLICATE

Regular verb: duplicate - duplicated - duplicated

Affirmation

Simple form	V-ing form
I could duplicate you could duplicate he could duplicate we could duplicate you could duplicate they could duplicate	I could be duplicating you could be duplicating he could be duplicating we could be duplicating you could be duplicating they could be duplicating
Perfect	V-ing perfect
I could have duplicated you could have duplicated he could have duplicated we could have duplicated you could have duplicated they could have duplicated	I could have been duplicating you could have been duplicating he could have been duplicating we could have been duplicating you could have been duplicating they could have been duplicating

Negation

Simple form	V-ing form
I couldn't duplicate you couldn't duplicate he couldn't duplicate we couldn't duplicate you couldn't duplicate they couldn't duplicate	I couldn't be duplicating you couldn't be duplicating he couldn't be duplicating we couldn't be duplicating you couldn't be duplicating they couldn't be duplicating
Perfect	V-ing perfect
I couldn't have duplicated you couldn't have duplicated he couldn't have duplicated we couldn't have duplicated you couldn't have duplicated they couldn't have duplicated	I couldn't have been duplicating you couldn't have been duplicating he couldn't have been duplicating we couldn't have been duplicating you couldn't have been duplicating they couldn't have been duplicating

Interrogative form

Simple form	V-ing form
could I duplicate? could you duplicate? could he duplicate? could we duplicate? could you duplicate? could they duplicate?	could I be duplicating? could you be duplicating? could he be duplicating? could we be duplicating? could you be duplicating? could they be duplicating?
Perfect	V-ing perfect
could I have duplicated? could you have duplicated? could he have duplicated? could we have duplicated? could you have duplicated? could they have duplicated?	could I have been duplicating? could you have been duplicating? could he have been duplicating? could we have been duplicating? could you have been duplicating? could they have been duplicating?

Interro-negative form

Simple form	V-ing form
couldn't I duplicate? couldn't you duplicate? couldn't he duplicate? couldn't we duplicate? couldn't you duplicate? couldn't they duplicate?	couldn't I be duplicating? couldn't you be duplicating? couldn't he be duplicating? couldn't we be duplicating? couldn't you be duplicating? couldn't they be duplicating?
Perfect	V-ing perfect
couldn't I have duplicated? couldn't you have duplicated? couldn't he have duplicated? couldn't we have duplicated? couldn't you have duplicated? couldn't they have duplicated?	couldn't I have been duplicating? couldn't you have been duplicating? couldn't he have been duplicating? couldn't we have been duplicating? couldn't you have been duplicating? couldn't they have been duplicating?