| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [adv] be able to | 11 |
|
| 2 | had [adv] been able to | 11 |
|
| 3 | had [adv] [been] able to | 11 |
|
| 4 | had [adv] [be] able to | 11 |
|
| 5 | had [not/n't] [be] able to | 8 |
|
| 6 | had not [be] able to | 8 |
|
