| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] be unable | 221 |
|
| 2 | [vb past] been unable | 219 |
|
| 3 | [vb past] [been] unable | 219 |
|
| 4 | had [be] unable | 210 |
|
| 5 | 'd [be] unable | 9 |
|
