| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] must have [been] [prep] | 154 |
|
| 2 | [Wh det] [pers pn] have [been] [prep] | 75 |
|
| 3 | [Wh det] [pers pn] must have [been] | 22 |
|
| 4 | [Wh det] must have [been] [prep] | 9 |
|
