| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [verb] been unable [verb] | 17 |
|
| 2 | but [verb] be unable [to-vb] | 17 |
|
| 3 | but have be unable [verb] | 17 |
|
| 4 | but had be unable [verb] | 9 |
|
| 5 | but [vb past] be unable [verb] | 9 |
|
| 6 | but have be unable [verb] | 5 |
|
| 7 | but [vb base] be unable [verb] | 5 |
|
