| I | can | |
|---|---|---|
| you | can | |
| he/she/it | can | |
| we | can | |
| you | can | |
| they | can |
| I | could | |
|---|---|---|
| you | could | |
| he/she/it | could | |
| we | could | |
| you | could | |
| they | could |
| I | have | been able to | |
|---|---|---|---|
| you | have | been able to | |
| he/she/it | has | been able to | |
| we | have | been able to | |
| you | have | been able to | |
| they | have | been able to |
| I | had | been able to | |
|---|---|---|---|
| you | had | been able to | |
| he/she/it | had | been able to | |
| we | had | been able to | |
| you | had | been able to | |
| they | had | been able to |