| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] n't [been] able [to-vb] | 92 |
|
| 2 | they [vb base] [been] able [to-vb] | 40 |
|
| 3 | they [vb base] n't [been] able | 7 |
|
