| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [verb] a | 17763 |
|
| 2 | [verb] at a | 7173 |
|
| 3 | [vb past] [verb] at | 3848 |
|
| 4 | [vb past] at a | 973 |
|
