| Simple | Progressive | Perfect | Progressive |
| Present |
| I retrofit |
| you retrofit |
| he/she/it retrofits |
| we retrofit |
| you all retrofit |
| they retrofit |
|
| I am retrofitting |
| you are retrofitting |
| he/she/it is retrofitting |
| we are retrofitting |
| you all are retrofitting |
| they are retrofitting |
|
| I have retrofitted |
| you have retrofitted |
| he/she/it has retrofitted |
| we have retrofitted |
| you all have retrofitted |
| they have retrofitted |
|
| I have been retrofitting |
| you have been retrofitting |
| he/she/it has been retrofitting |
| we have been retrofitting |
| you all have been retrofitting |
| they have been retrofitting |
|
| Past |
| I retrofitted |
| you retrofitted |
| he/she/it retrofitted |
| we retrofitted |
| you all retrofitted |
| they retrofitted |
|
| I was retrofitting |
| you were retrofitting |
| he/she/it was retrofitting |
| we were retrofitting |
| you all were retrofitting |
| they were retrofitting |
|
| I had retrofitted |
| you had retrofitted |
| he/she/it had retrofitted |
| we had retrofitted |
| you all had retrofitted |
| they had retrofitted |
|
| I had been retrofitting |
| you had been retrofitting |
| he/she/it had been retrofitting |
| we had been retrofitting |
| you all had been retrofitting |
| they had been retrofitting |
|
| Future |
| I will retrofit |
| you will retrofit |
| he/she/it will retrofit |
| we will retrofit |
| you all will retrofit |
| they will retrofit |
|
| I will be retrofitting |
| you will be retrofitting |
| he/she/it will be retrofitting |
| we are retrofitting |
| you all will be retrofitting |
| they will be retrofitting |
|
| I will have retrofitted |
| you will have retrofitted |
| he/she/it will have retrofitted |
| we will have retrofitted |
| you all will have retrofitted |
| they will have retrofitted |
|
| I will have been retrofitting |
| you will have been retrofitting |
| he/she/it will have been retrofitting |
| we will have been retrofitting |
| you all will have been retrofitting |
| they will have been retrofitting |
|
