English verb conjugation COULD DEMONSTRATE

Regular verb: demonstrate - demonstrated - demonstrated

Affirmation

Simple form

I could demonstrate
you could demonstrate
she could demonstrate
we could demonstrate
you could demonstrate
they could demonstrate

V-ing form

I could be demonstrating
you could be demonstrating
she could be demonstrating
we could be demonstrating
you could be demonstrating
they could be demonstrating

Perfect

I could have demonstrated
you could have demonstrated
she could have demonstrated
we could have demonstrated
you could have demonstrated
they could have demonstrated

V-ing perfect

I could have been demonstrating
you could have been demonstrating
she could have been demonstrating
we could have been demonstrating
you could have been demonstrating
they could have been demonstrating

Negation

Simple form

I couldn't demonstrate
you couldn't demonstrate
she couldn't demonstrate
we couldn't demonstrate
you couldn't demonstrate
they couldn't demonstrate

V-ing form

I couldn't be demonstrating
you couldn't be demonstrating
she couldn't be demonstrating
we couldn't be demonstrating
you couldn't be demonstrating
they couldn't be demonstrating

Perfect

I couldn't have demonstrated
you couldn't have demonstrated
she couldn't have demonstrated
we couldn't have demonstrated
you couldn't have demonstrated
they couldn't have demonstrated

V-ing perfect

I couldn't have been demonstrating
you couldn't have been demonstrating
she couldn't have been demonstrating
we couldn't have been demonstrating
you couldn't have been demonstrating
they couldn't have been demonstrating

Interrogative form

Simple form

could I demonstrate?
could you demonstrate?
could she demonstrate?
could we demonstrate?
could you demonstrate?
could they demonstrate?

V-ing form

could I be demonstrating?
could you be demonstrating?
could she be demonstrating?
could we be demonstrating?
could you be demonstrating?
could they be demonstrating?

Perfect

could I have demonstrated?
could you have demonstrated?
could she have demonstrated?
could we have demonstrated?
could you have demonstrated?
could they have demonstrated?

V-ing perfect

could I have been demonstrating?
could you have been demonstrating?
could she have been demonstrating?
could we have been demonstrating?
could you have been demonstrating?
could they have been demonstrating?

Interro-negative form

Simple form

couldn't I demonstrate?
couldn't you demonstrate?
couldn't she demonstrate?
couldn't we demonstrate?
couldn't you demonstrate?
couldn't they demonstrate?

V-ing form

couldn't I be demonstrating?
couldn't you be demonstrating?
couldn't she be demonstrating?
couldn't we be demonstrating?
couldn't you be demonstrating?
couldn't they be demonstrating?

Perfect

couldn't I have demonstrated?
couldn't you have demonstrated?
couldn't she have demonstrated?
couldn't we have demonstrated?
couldn't you have demonstrated?
couldn't they have demonstrated?

V-ing perfect

couldn't I have been demonstrating?
couldn't you have been demonstrating?
couldn't she have been demonstrating?
couldn't we have been demonstrating?
couldn't you have been demonstrating?
couldn't they have been demonstrating?

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