| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there must have been [adj] | 84 |
|
| 2 | there must have been [adj] | 83 |
|
| 3 | there must have been [det] | 47 |
|
| 4 | there must have been some | 24 |
|
| 5 | there must have been some | 24 |
|
| 6 | there must have been [adj] | 19 |
|
| 7 | there must have been [num] | 18 |
|
| 8 | there must have been many | 18 |
|
| 9 | there must have been many | 18 |
|
| 10 | there must have been other | 6 |
|
| 11 | there must have been other | 6 |
|
