| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] not been able | 10 |
|
| 2 | it have not been able | 10 |
|
| 3 | it [verb] not been able | 8 |
|
| 4 | it has not been able | 5 |
|
| 5 | it [vb past] not been able | 5 |
|
| 6 | it [vb -s] not been able | 5 |
|
| 7 | it had not been able | 5 |
|
