| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [vb pp] a bad back | 6 |
|
| 2 | [vb base] [vb pp] a bad back | 6 |
|
| 3 | 've [vb pp] a bad back | 6 |
|
| 4 | have [vb pp] a bad back | 6 |
|
