| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] must have been [adj] | 27 |
|
| 2 | which must have been [adj] | 19 |
|
| 3 | [Wh det] must have been [adj] | 16 |
|
| 4 | [Wh det] must have been [num] | 9 |
|
| 5 | what must have been [adj] | 8 |
|
| 6 | [Wh det] must have been one | 7 |
|
| 7 | [Wh det] must have been one | 7 |
|
