| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] [prep] studies | 21 |
|
| 2 | [vb -s] been [vb pp] [prep] studies | 12 |
|
| 3 | has been [vb pp] [prep] studies | 12 |
|
| 4 | [verb] been [vb pp] in studies | 10 |
|
| 5 | have been [vb pp] [prep] studies | 8 |
|
| 6 | [vb base] been [vb pp] [prep] studies | 8 |
|
| 7 | [verb] been [vb pp] from studies | 5 |
|
