English verb conjugation COULD TREPHINE

Regular verb: trephine - trephined - trephined

Affirmation

Simple form

I could trephine
you could trephine
he could trephine
we could trephine
you could trephine
they could trephine

V-ing form

I could be trephining
you could be trephining
he could be trephining
we could be trephining
you could be trephining
they could be trephining

Perfect

I could have trephined
you could have trephined
he could have trephined
we could have trephined
you could have trephined
they could have trephined

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I trephine?
could you trephine?
could he trephine?
could we trephine?
could you trephine?
could they trephine?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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