| Simple | Progressive | Perfect | Progressive |
| Present |
| I contribute |
| you contribute |
| he/she/it contributes |
| we contribute |
| you all contribute |
| they contribute |
|
| I am contributing |
| you are contributing |
| he/she/it is contributing |
| we are contributing |
| you all are contributing |
| they are contributing |
|
| I have contributed |
| you have contributed |
| he/she/it has contributed |
| we have contributed |
| you all have contributed |
| they have contributed |
|
| I have been contributing |
| you have been contributing |
| he/she/it has been contributing |
| we have been contributing |
| you all have been contributing |
| they have been contributing |
|
| Past |
| I contributed |
| you contributed |
| he/she/it contributed |
| we contributed |
| you all contributed |
| they contributed |
|
| I was contributing |
| you were contributing |
| he/she/it was contributing |
| we were contributing |
| you all were contributing |
| they were contributing |
|
| I had contributed |
| you had contributed |
| he/she/it had contributed |
| we had contributed |
| you all had contributed |
| they had contributed |
|
| I had been contributing |
| you had been contributing |
| he/she/it had been contributing |
| we had been contributing |
| you all had been contributing |
| they had been contributing |
|
| Future |
| I will contribute |
| you will contribute |
| he/she/it will contribute |
| we will contribute |
| you all will contribute |
| they will contribute |
|
| I will be contributing |
| you will be contributing |
| he/she/it will be contributing |
| we are contributing |
| you all will be contributing |
| they will be contributing |
|
| I will have contributed |
| you will have contributed |
| he/she/it will have contributed |
| we will have contributed |
| you all will have contributed |
| they will have contributed |
|
| I will have been contributing |
| you will have been contributing |
| he/she/it will have been contributing |
| we will have been contributing |
| you all will have been contributing |
| they will have been contributing |
|
