| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [pers pn] [vb past] been unable | 5 |
|
| 2 | but [pron] [vb past] been unable | 5 |
|
| 3 | but [vb past] been unable [verb] | 9 |
|
| 4 | but [vb past] been unable [to-vb] | 9 |
|
