Present
I understudy
you understudy
he understudies
we understudy
you understudy
they understudy

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

Past
I understudied
you understudied
he understudied
we understudied
you understudied
they understudied

Pluperfect
I had understudied
you had understudied
he had understudied
we had understudied
you had understudied
they had understudied

Future
I will understudy
you will understudy
he will understudy
we will understudy
you will understudy
they will understudy

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

Present
I understudy
you understudy
he understudy
we understudy
you understudy
they understudy

Present
I have understudied
you have understudied
he have understudied
we have understudied
you have understudied
they have understudied

Imperfect
I understudied
you understudied
he understudied
we understudied
you understudied
they understudied

Pluperfect
I had understudied
you had understudied
he had understudied
we had understudied
you had understudied
they had understudied

Present
I would understudy
you would understudy
he would understudy
we would understudy
you would understudy
they would understudy

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

you understudy
we Let's understudy
you understudy

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

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

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

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

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

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

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

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