| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [verb] been able [to-vb] [noun] | 8 |
|
| 2 | not [vb infin] been able [verb] [noun] | 8 |
|
| 3 | not have been able [verb] [noun] | 8 |
|
| 4 | not have been able [verb] [noun] | 8 |
|
| 5 | not [verb] been able [verb] [noun sg] | 5 |
|
