| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] there has been a | 11 |
|
| 2 | [vb -s] there has been a | 8 |
|
| 3 | think there has been a | 6 |
|
| 4 | think there has been a | 5 |
|
| 5 | say there has been a | 5 |
|
