| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] [noun] | 76118 |
|
| 2 | once [prep] [noun] | 430 |
|
| 3 | once [vb past] [prep] | 397 |
|
| 4 | once [vb past] [noun] | 175 |
|
