| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been extensive [noun] | 17 |
|
| 2 | [verb] been extensive [noun] | 17 |
|
| 3 | [vb -s] been extensive [noun] | 13 |
|
| 4 | has been extensive [noun] | 13 |
|
| 5 | been extensive [noun] [prep] | 12 |
|
| 6 | been extensive [noun] [prep] | 12 |
|
| 7 | been extensive [noun] of | 6 |
|
| 8 | been extensive [noun] of | 6 |
|
