| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there have been [adj] [noun] | 1745 |
|
| 2 | may have been [adj] [noun] | 90 |
|
| 3 | there may have been [adj] | 55 |
|
| 4 | there may have been [noun] | 27 |
|
