| I | must |
|---|---|
| you | must |
| he/she/it | must |
| we | must |
| you | must |
| they | must |
| I | had to |
|---|---|
| you | had to |
| he/she/it | had to |
| we | had to |
| you | had to |
| they | had to |
| I | have | had to |
|---|---|---|
| you | have | had to |
| he/she/it | has | had to |
| we | have | had to |
| you | have | had to |
| they | have | had to |
| I | had | had to |
|---|---|---|
| you | had | had to |
| he/she/it | had | had to |
| we | had | had to |
| you | had | had to |
| they | had | had to |