| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there must [vb infin] been [prep] [adv] | 11 |
|
| 2 | there must [verb] been [prep] [adv] | 11 |
|
| 3 | there must have been [prep] [adv] | 11 |
|
| 4 | there must have been [prep] [adv] | 11 |
|
| 5 | there must [verb] been [prep] [adv] | 8 |
|
| 6 | there must [verb] been [prep] least | 8 |
|
| 7 | there must [verb] been at [adv] | 8 |
|
| 8 | there must [verb] been at [adv] | 8 |
|
| 9 | there must [verb] been [prep] least | 8 |
|
