English verb conjugation COULD SURFACE

Regular verb: surface - surfaced - surfaced

Affirmation

Simple form

I could surface
you could surface
he could surface
we could surface
you could surface
they could surface

V-ing form

I could be surfacing
you could be surfacing
he could be surfacing
we could be surfacing
you could be surfacing
they could be surfacing

Perfect

I could have surfaced
you could have surfaced
he could have surfaced
we could have surfaced
you could have surfaced
they could have surfaced

V-ing perfect

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

Negation

Simple form

I could not surface
you could not surface
he could not surface
we could not surface
you could not surface
they could not surface

V-ing form

I could not be surfacing
you could not be surfacing
he could not be surfacing
we could not be surfacing
you could not be surfacing
they could not be surfacing

Perfect

I could not have surfaced
you could not have surfaced
he could not have surfaced
we could not have surfaced
you could not have surfaced
they could not have surfaced

V-ing perfect

I could not have been surfacing
you could not have been surfacing
he could not have been surfacing
we could not have been surfacing
you could not have been surfacing
they could not have been surfacing

Interrogative form

Simple form

could I surface?
could you surface?
could he surface?
could we surface?
could you surface?
could they surface?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

could I not surface?
could you not surface?
could he not surface?
could we not surface?
could you not surface?
could they not surface?

V-ing form

could I not be surfacing?
could you not be surfacing?
could he not be surfacing?
could we not be surfacing?
could you not be surfacing?
could they not be surfacing?

Perfect

could I not have surfaced?
could you not have surfaced?
could he not have surfaced?
could we not have surfaced?
could you not have surfaced?
could they not have surfaced?

V-ing perfect

could I not have been surfacing?
could you not have been surfacing?
could he not have been surfacing?
could we not have been surfacing?
could you not have been surfacing?
could they not have been surfacing?

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