| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [pron] must [vb infin] been some | 8 |
|
| 2 | [conj] [pron] must have been some | 8 |
|
| 3 | [conj] [pron] must have been some | 8 |
|
| 4 | [conj] there must [verb] been some | 6 |
|
| 5 | [conj] [ex0] must [verb] been some | 6 |
|
| 6 | [conj] there must [verb] been some | 6 |
|
