| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have been sitting [prep] | 10 |
|
| 2 | who [vb past] been sitting [prep] | 10 |
|
| 3 | who [verb] been sitting [prep] | 10 |
|
| 4 | who had been sitting [prep] | 9 |
|
