| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have been one | 22 |
|
| 2 | [pron] must [verb] been one | 22 |
|
| 3 | [pron] must [vb infin] been one | 22 |
|
| 4 | [pron] must have been one | 21 |
|
| 5 | [pers pn] must [verb] been one | 13 |
|
| 6 | it must [verb] been one | 9 |
|
| 7 | it must [verb] been one | 9 |
|
| 8 | [Wh det] must [verb] been one | 7 |
|
| 9 | what must [verb] been one | 5 |
|
| 10 | what must [verb] been one | 5 |
|
