| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [vb pp] [prep] | 1838 |
|
| 2 | have been [vb pp] [prep] several | 175 |
|
| 3 | it have been [vb pp] several | 12 |
|
| 4 | it have [vb pp] [prep] several | 9 |
|
| 5 | it have been [prep] several | 5 |
|
