| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [pron] [vb past] be used | 9 |
|
| 2 | [Wh det] [pron] [vb past] [been] used | 8 |
|
| 3 | [Wh det] [pron] [vb past] been used | 8 |
|
| 4 | [Wh det] [pers pn] [vb past] [be] used | 8 |
|
| 5 | [Wh det] [pron] had [be] used | 6 |
|
| 6 | what [pron] [vb past] [be] used | 6 |
|
