| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] have not been able | 12 |
|
| 2 | [Wh pn] [verb] not been able | 12 |
|
| 3 | who [verb] not been able | 12 |
|
| 4 | [Wh pn] [verb] not been able | 7 |
|
| 5 | [Wh pn] have not been able | 6 |
|
| 6 | [Wh pn] [vb base] not been able | 6 |
|
| 7 | [Wh pn] [verb] n't been able | 5 |
|
