English verb conjugation COULD PREASCERTAIN

Regular verb: preascertain - preascertained - preascertained

Affirmation

Simple form

I could preascertain
you could preascertain
he could preascertain
we could preascertain
you could preascertain
they could preascertain

V-ing form

I could be preascertaining
you could be preascertaining
he could be preascertaining
we could be preascertaining
you could be preascertaining
they could be preascertaining

Perfect

I could have preascertained
you could have preascertained
he could have preascertained
we could have preascertained
you could have preascertained
they could have preascertained

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I preascertain?
could you preascertain?
could he preascertain?
could we preascertain?
could you preascertain?
could they preascertain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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