| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | studies have been [verb] [prep] | 46 |
|
| 2 | studies have be [vb pp] [prep] | 46 |
|
| 3 | studies have be make [prep] | 14 |
|
| 4 | studies have be made [prep] | 14 |
|
| 5 | studies have be [verb] on | 13 |
|
| 6 | studies have be [verb] in | 10 |
|
| 7 | studies have be [verb] of | 9 |
|
| 8 | studies have be do [prep] | 6 |
|
| 9 | studies have be done [prep] | 6 |
|
| 10 | studies have be [verb] with | 5 |
|
