| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [vb pp] [prep] many | 20 |
|
| 2 | it has been [vb pp] [prep] many | 16 |
|
| 3 | it have been [vb pp] for many | 10 |
|
| 4 | it have been used [prep] many | 6 |
|
| 5 | it have been [vb pp] by many | 5 |
|
| 6 | it have been known [prep] many | 5 |
|
