| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] be working [prep] | 14 |
|
| 2 | who [vb past] [been] working [prep] | 14 |
|
| 3 | who [vb past] been working [prep] | 14 |
|
| 4 | who had [be] working [prep] | 12 |
|
| 5 | who [vb past] [be] working in | 6 |
|
| 6 | who [vb past] [be] working on | 5 |
|
