| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] [prep] some extent | 10 |
|
| 2 | have been [vb pp] to some extent | 10 |
|
| 3 | have been [vb pp] [prep] some extent | 10 |
|
| 4 | has been [vb pp] [prep] some extent | 7 |
|
