| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] i [modal v] [vb infin] | 1711 |
|
| 2 | [vb past] [pron] must [vb infin] | 347 |
|
| 3 | [verb] i must [vb infin] | 247 |
|
| 4 | [vb past] i must [verb] | 64 |
|
