| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] at [art] | 226 |
|
| 2 | who [vb past] [been] [art] | 192 |
|
| 3 | [vb past] [been] at [art] | 162 |
|
| 4 | who [vb past] [been] at | 47 |
|
