English verb conjugation COULD UNDERTAIN

Regular verb: undertain - undertained - undertained

Affirmation

Simple form

I could undertain
you could undertain
he could undertain
we could undertain
you could undertain
they could undertain

V-ing form

I could be undertaining
you could be undertaining
he could be undertaining
we could be undertaining
you could be undertaining
they could be undertaining

Perfect

I could have undertained
you could have undertained
he could have undertained
we could have undertained
you could have undertained
they could have undertained

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I undertain?
could you undertain?
could he undertain?
could we undertain?
could you undertain?
could they undertain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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