| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] [pers pn] [modal v] | 4473 |
|
| 2 | [prep] [pron] [pers pn] must | 225 |
|
| 3 | [prep] [Wh det] [pron] must | 175 |
|
| 4 | [prep] [Wh det] [pers pn] must | 154 |
|
