| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have not [adv] been able | 8 |
|
| 2 | [pers pn] [vb base] not [adv] been able | 8 |
|
| 3 | [pron] [vb base] not yet been able | 6 |
|
