| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must [verb] been [noun pl] | 21 |
|
| 2 | [pron] must [vb infin] [been] [noun pl] | 21 |
|
| 3 | [pron] must have [been] [noun pl] | 21 |
|
| 4 | [pron] must have [been] [noun pl] | 21 |
|
| 5 | there must [verb] [been] [noun pl] | 11 |
|
| 6 | there must [verb] [been] [noun pl] | 11 |
|
| 7 | [ex0] must [verb] [been] [noun pl] | 11 |
|
| 8 | [pers pn] must [verb] [been] [noun pl] | 8 |
|
