| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [vb base] not been able | 170 |
|
| 2 | [Wh pn] [verb] not been able | 12 |
|
| 3 | [Wh pn] [vb base] not been [adj] | 11 |
|
| 4 | [Wh pn] [vb base] [adv] been able | 7 |
|
| 5 | [Wh pn] [vb base] not be able | 6 |
|
| 6 | [Wh pn] [vb base] not [be] able | 6 |
|
| 7 | [Wh pn] [vb base] not [been] able | 6 |
|
