
Verbo regular: contribute - contributed - contributed
| Presente | Presente contínuo | Pretérito | Preterito contínuo | 
| I contribute you contribute he contributes we contribute you contribute they contribute | I am contributing you are contributing he is contributing we are contributing you are contributing they are contributing | I contributed you contributed he contributed we contributed you contributed they contributed | I was contributing you were contributing he was contributing we were contributing you were contributing they were contributing | 
| Presente perfeito | Presente perfeito contínuo | Mais perfeito | Contínuo mais perfeito | 
| I have contributed you have contributed he has contributed we have contributed you have contributed they have contributed | I have been contributing you have been contributing he has been contributing we have been contributing you have been contributing they have been contributing | I had contributed you had contributed he had contributed we had contributed you had contributed they had contributed | I had been contributing you had been contributing he had been contributing we had been contributing you had been contributing they had been contributing | 
| Futuro | Futuro contínuo | futuro perfeito | futuro perfeito contínuo | 
| I will contribute you will contribute he will contribute we will contribute you will contribute they will contribute | I will be contributing you will be contributing he will be contributing we will be contributing you will be contributing they will be contributing | I will have contributed you will have contributed he will have contributed we will have contributed you will have contributed they will have contributed | I will have been contributing you will have been contributing he will have been contributing we will have been contributing you will have been contributing they will have been contributing | 
| Presente | Presente contínuo | Passado | Passado contínuo | 
| I would contribute you would contribute he would contribute we would contribute you would contribute they would contribute | I would be contributing you would be contributing he would be contributing we would be contributing you would be contributing they would be contributing | I would have contributed you would have contributed he would have contributed we would have contributed you would have contributed they would have contributed | I would have been contributing you would have been contributing he would have been contributing we would have been contributing you would have been contributing they would have been contributing | 
| Infinitivo | Imperativo | 
| Infinitivo | Imperativo | ||
| to contribute | contribute Let's contribute contribute | 
| Presente | Passado | ||
| contributing | contributed |