English verb conjugation
COULD DUPLICATE

Regular verb: duplicate - duplicated - duplicated

Affirmation

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