| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been [noun] | 814 |
|
| 2 | [vb -s] extensive [noun] | 85 |
|
| 3 | been extensive [noun] | 18 |
|
| 4 | [vb -s] been extensive | 18 |
|
