| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what must have | 42 |
|
| 2 | [prep] [pers pn] must have | 42 |
|
| 3 | what [pers pn] must have | 41 |
|
| 4 | [prep] what [pers pn] must | 32 |
|
