| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been [vb pp] [prep] some [noun] | 139 |
|
| 2 | [vb -s] been [vb pp] [prep] some [noun pl] | 68 |
|
| 3 | [vb -s] been [vb pp] [prep] [adj] studies | 31 |
|
| 4 | [verb] been [vb pp] [prep] some studies | 6 |
|
| 5 | [vb -s] [been] [vb pp] [prep] some studies | 6 |
|
| 6 | [vb -s] been [vb pp] [prep] some study | 6 |
|
| 7 | [vb -s] been [verb] [prep] some studies | 6 |
|
| 8 | [vb -s] be [vb pp] [prep] some studies | 6 |
|
| 9 | [vb -s] [be] [vb pp] [prep] some studies | 6 |
|
