| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [pers pn] must [vb infin] | 178 |
|
| 2 | [prep] [pers pn] must [vb infin] | 116 |
|
| 3 | [prep] what must [vb infin] | 54 |
|
| 4 | [prep] what [pers pn] must | 32 |
|
