| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there must have been [adv] | 19 |
|
| 2 | there must have been [adv] | 19 |
|
| 3 | there must have been more | 7 |
|
| 4 | there must have been more | 7 |
|
| 5 | there must have been about | 6 |
|
| 6 | there must have been about | 6 |
|
