| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] be working on | 10 |
|
| 2 | who [verb] [be] working on | 10 |
|
| 3 | who [verb] [been] working on | 10 |
|
| 4 | who have [be] working on | 10 |
|
| 5 | who [verb] been working on | 10 |
|
| 6 | who [vb past] [be] working on | 5 |
|
