| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [adv] been [verb] [prep] | 2061 |
|
| 2 | studies [vb base] been [verb] [prep] | 46 |
|
| 3 | studies [vb base] [adv] been [verb] | 16 |
|
| 4 | studies [vb base] [adv] [verb] [prep] | 5 |
|
