| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] [adv] [vb past] [prep] | 658 |
|
| 2 | [Wh pn] [adv] [vb past] [prep] | 658 |
|
| 3 | [pron] once [vb past] [prep] | 230 |
|
| 4 | [Wh pn] once [vb past] [prep] | 43 |
|
| 5 | [Wh pn] once [verb] [prep] | 43 |
|
