| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [adj] studies | 23 |
|
| 2 | [vb base] been [det] studies | 15 |
|
| 3 | [vb base] been many studies | 6 |
|
| 4 | [vb base] been few studies | 6 |
|
| 5 | [vb base] been few studies | 6 |
|
| 6 | [vb base] been [adj] studies | 6 |
|
| 7 | [vb base] been many studies | 6 |
|
