| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they have n't [been] able [verb] | 6 |
|
| 2 | they [vb base] n't [been] able [verb] | 6 |
|
| 3 | they [vb base] n't [been] able [to-vb] | 6 |
|
| 4 | they [vb base] n't been able [verb] | 6 |
|
