| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [verb] [prep] some [noun pl] | 67 |
|
| 2 | has been [vb pp] [prep] some [noun pl] | 63 |
|
| 3 | has been [verb] in some [noun pl] | 30 |
|
| 4 | has been [verb] by some [noun pl] | 22 |
|
| 5 | has been [verb] for some [noun pl] | 12 |
|
| 6 | has been [verb] [prep] some years | 8 |
|
| 7 | has been [verb] [prep] some studies | 6 |
|
| 8 | has been [verb] [prep] some writers | 5 |
|
