| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [verb] [prep] | 59545 |
|
| 2 | once [verb] [prep] | 1444 |
|
| 3 | [vb past] once [verb] | 706 |
|
| 4 | [vb past] once [prep] | 70 |
|
