| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [pron] [verb] not been able | 8 |
|
| 2 | which [pron] have not been able | 8 |
|
| 3 | which [pers pn] [verb] not been able | 8 |
|
| 4 | which [pron] [vb base] not been able | 5 |
|
