Present
I trephine
you trephine
he trephines
we trephine
you trephine
they trephine

Perfect
I have trephined
you have trephined
he has trephined
we have trephined
you have trephined
they have trephined

Past
I trephined
you trephined
he trephined
we trephined
you trephined
they trephined

Pluperfect
I had trephined
you had trephined
he had trephined
we had trephined
you had trephined
they had trephined

Future
I will trephine
you will trephine
he will trephine
we will trephine
you will trephine
they will trephine

Future perfect
I will have trephined
you will have trephined
he will have trephined
we will have trephined
you will have trephined
they will have trephined

Present
I trephine
you trephine
he trephine
we trephine
you trephine
they trephine

Present
I have trephined
you have trephined
he have trephined
we have trephined
you have trephined
they have trephined

Imperfect
I trephined
you trephined
he trephined
we trephined
you trephined
they trephined

Pluperfect
I had trephined
you had trephined
he had trephined
we had trephined
you had trephined
they had trephined

Present
I would trephine
you would trephine
he would trephine
we would trephine
you would trephine
they would trephine

Perfect
I would have trephined
you would have trephined
he would have trephined
we would have trephined
you would have trephined
they would have trephined

you trephine
we Let's trephine
you trephine

Present
I am trephining
you are trephining
he is trephining
we are trephining
you are trephining
they are trephining

Perfect
I have been trephining
you have been trephining
he has been trephining
we have been trephining
you have been trephining
they have been trephining

Past
I was trephining
you were trephining
he was trephining
we were trephining
you were trephining
they were trephining

Pluperfect
I had been trephining
you had been trephining
he had been trephining
we had been trephining
you had been trephining
they had been trephining

Future
I will be trephining
you will be trephining
he will be trephining
we will be trephining
you will be trephining
they will be trephining

Future perfect
I will have been trephining
you will have been trephining
he will have been trephining
we will have been trephining
you will have been trephining
they will have been trephining

Present
I would be trephining
you would be trephining
he would be trephining
we would be trephining
you would be trephining
they would be trephining

Perfect
I would have been trephining
you would have been trephining
he would have been trephining
we would have been trephining
you would have been trephining
they would have been trephining