| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | if [pers pn] [vb past] been able to | 5 |
|
| 2 | if [pers pn] [verb] been able to | 5 |
|
| 3 | if [pers pn] had been able to | 5 |
|
| 4 | if [pers pn] have been able to | 5 |
|
