| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i [vb past] [prep] | 19969 |
|
| 2 | once [vb past] [prep] | 397 |
|
| 3 | i once [vb past] | 302 |
|
| 4 | i once [prep] | 8 |
|
