| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been used [prep] | 854 |
|
| 2 | [verb] to have been [prep] | 187 |
|
| 3 | [verb] to have been used | 42 |
|
| 4 | to have been used [prep] | 34 |
|
