| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what they [modal v] [vb infin] | 630 |
|
| 2 | what [pron] must [vb infin] | 184 |
|
| 3 | [pron] they must [vb infin] | 65 |
|
| 4 | what they must [verb] | 19 |
|
