| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [vb pp] at [art] | 145 |
|
| 2 | [vb -s] been [vb pp] at the | 114 |
|
| 3 | [vb -s] been [vb pp] at a | 32 |
|
| 4 | 's been [vb pp] at [art] | 7 |
|
| 5 | [vb -s] been developed at [art] | 5 |
|
