| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb base] [been] [vb pp] at | 12 |
|
| 2 | [Wh det] have [been] [vb pp] at | 12 |
|
| 3 | [Wh det] [vb base] been [vb pp] at | 12 |
|
