| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there has been a | 1287 |
|
| 2 | there had been a | 656 |
|
| 3 | there 's been a | 268 |
|
| 4 | there have been a | 170 |
|
| 5 | there 'd been a | 58 |
|
| 6 | there 've been a | 9 |
|
