| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] had [been] [vb pp] on | 75 |
|
| 2 | [Wh det] [vb past] been [vb pp] on | 75 |
|
| 3 | which [vb past] [been] [vb pp] on | 68 |
|
| 4 | what [vb past] [been] [vb pp] on | 7 |
|
