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 couldn't surface
you couldn't surface
he couldn't surface
we couldn't surface
you couldn't surface
they couldn't surface

V-ing form

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

Perfect

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

V-ing perfect

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

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

V-ing form

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

Perfect

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

V-ing perfect

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

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