| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of what [pers pn] must [vb infin] | 10 |
|
| 2 | of [Wh det] [pers pn] must have | 6 |
|
| 3 | of which [pers pn] must [vb infin] | 6 |
|
| 4 | of [Wh det] they must [vb infin] | 6 |
|
