| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb past] [pers pn] [verb] | 685 |
|
| 2 | [vb past] [pers pn] must [verb] | 330 |
|
| 3 | which [pers pn] must [verb] | 195 |
|
| 4 | which [vb past] [pers pn] must | 7 |
|
