| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] [been] [prep] [noun] | 137 |
|
| 2 | [pron] [vb past] [been] [prep] duty | 11 |
|
| 3 | who [verb] [been] [prep] duty | 6 |
|
| 4 | who [vb past] [be] [prep] duty | 6 |
|
