| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] unable | 490 |
|
| 2 | [verb] been unable | 490 |
|
| 3 | [vb past] [been] unable | 219 |
|
| 4 | had [been] unable | 210 |
|
| 5 | [vb base] [been] unable | 146 |
|
| 6 | have [been] unable | 131 |
|
| 7 | [vb -s] [been] unable | 88 |
|
| 8 | has [been] unable | 87 |
|
| 9 | [vb infin] [been] unable | 32 |
|
| 10 | have [been] unable | 32 |
|
| 11 | 've [been] unable | 15 |
|
| 12 | 'd [been] unable | 9 |
|
