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