| Simple | Progressive | Perfect | Progressive |
Present |
I undergo |
you undergo |
he/she/it undergoes |
we undergo |
you all undergo |
they undergo |
|
I am undergoing |
you are undergoing |
he/she/it is undergoing |
we are undergoing |
you all are undergoing |
they are undergoing |
|
I have undergone |
you have undergone |
he/she/it has undergone |
we have undergone |
you all have undergone |
they have undergone |
|
I have been undergoing |
you have been undergoing |
he/she/it has been undergoing |
we have been undergoing |
you all have been undergoing |
they have been undergoing |
|
Past |
I underwent |
you underwent |
he/she/it underwent |
we underwent |
you all underwent |
they underwent |
|
I was undergoing |
you were undergoing |
he/she/it was undergoing |
we were undergoing |
you all were undergoing |
they were undergoing |
|
I had undergone |
you had undergone |
he/she/it had undergone |
we had undergone |
you all had undergone |
they had undergone |
|
I had been undergoing |
you had been undergoing |
he/she/it had been undergoing |
we had been undergoing |
you all had been undergoing |
they had been undergoing |
|
Future |
I will undergo |
you will undergo |
he/she/it will undergo |
we will undergo |
you all will undergo |
they will undergo |
|
I will be undergoing |
you will be undergoing |
he/she/it will be undergoing |
we are undergoing |
you all will be undergoing |
they will be undergoing |
|
I will have undergone |
you will have undergone |
he/she/it will have undergone |
we will have undergone |
you all will have undergone |
they will have undergone |
|
I will have been undergoing |
you will have been undergoing |
he/she/it will have been undergoing |
we will have been undergoing |
you all will have been undergoing |
they will have been undergoing |
|