| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [pron] must [verb] been [prep] | 10 |
|
| 2 | [coord] [pron] must have been [prep] | 10 |
|
| 3 | [coord] [pron] must have been [prep] | 10 |
|
| 4 | [coord] [pron] must [vb infin] been [prep] | 10 |
|
| 5 | [coord] [pers pn] must [verb] been [prep] | 8 |
|
| 6 | and [pron] must [verb] been [prep] | 6 |
|
| 7 | [coord] it must [verb] been [prep] | 5 |
|
| 8 | [coord] it must [verb] been [prep] | 5 |
|
