English verb conjugation COULD SUBSTANTIATE

Regular verb: substantiate - substantiated - substantiated

Affirmation

Simple form

I could substantiate
you could substantiate
he could substantiate
we could substantiate
you could substantiate
they could substantiate

V-ing form

I could be substantiating
you could be substantiating
he could be substantiating
we could be substantiating
you could be substantiating
they could be substantiating

Perfect

I could have substantiated
you could have substantiated
he could have substantiated
we could have substantiated
you could have substantiated
they could have substantiated

V-ing perfect

I could have been substantiating
you could have been substantiating
he could have been substantiating
we could have been substantiating
you could have been substantiating
they could have been substantiating

Negation

Simple form

I couldn't substantiate
you couldn't substantiate
he couldn't substantiate
we couldn't substantiate
you couldn't substantiate
they couldn't substantiate

V-ing form

I couldn't be substantiating
you couldn't be substantiating
he couldn't be substantiating
we couldn't be substantiating
you couldn't be substantiating
they couldn't be substantiating

Perfect

I couldn't have substantiated
you couldn't have substantiated
he couldn't have substantiated
we couldn't have substantiated
you couldn't have substantiated
they couldn't have substantiated

V-ing perfect

I couldn't have been substantiating
you couldn't have been substantiating
he couldn't have been substantiating
we couldn't have been substantiating
you couldn't have been substantiating
they couldn't have been substantiating

Interrogative form

Simple form

could I substantiate?
could you substantiate?
could he substantiate?
could we substantiate?
could you substantiate?
could they substantiate?

V-ing form

could I be substantiating?
could you be substantiating?
could he be substantiating?
could we be substantiating?
could you be substantiating?
could they be substantiating?

Perfect

could I have substantiated?
could you have substantiated?
could he have substantiated?
could we have substantiated?
could you have substantiated?
could they have substantiated?

V-ing perfect

could I have been substantiating?
could you have been substantiating?
could he have been substantiating?
could we have been substantiating?
could you have been substantiating?
could they have been substantiating?

Interro-negative form

Simple form

couldn't I substantiate?
couldn't you substantiate?
couldn't he substantiate?
couldn't we substantiate?
couldn't you substantiate?
couldn't they substantiate?

V-ing form

couldn't I be substantiating?
couldn't you be substantiating?
couldn't he be substantiating?
couldn't we be substantiating?
couldn't you be substantiating?
couldn't they be substantiating?

Perfect

couldn't I have substantiated?
couldn't you have substantiated?
couldn't he have substantiated?
couldn't we have substantiated?
couldn't you have substantiated?
couldn't they have substantiated?

V-ing perfect

couldn't I have been substantiating?
couldn't you have been substantiating?
couldn't he have been substantiating?
couldn't we have been substantiating?
couldn't you have been substantiating?
couldn't they have been substantiating?

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