| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] [been] at [noun] | 21 |
|
| 2 | who [vb past] been at [noun] | 21 |
|
| 3 | who had [been] at [noun] | 19 |
|
| 4 | who [vb past] [been] at [noun prp] | 15 |
|
