| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] for a [adj -er] | 15 |
|
| 2 | has been [vb pp] for a [adj -er] | 13 |
|
| 3 | have been [vb pp] for a further | 11 |
|
| 4 | have been extended for a [adj -er] | 6 |
|
