| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] a | 28724 |
|
| 2 | [prep] a time | 4735 |
|
| 3 | [vb past] [prep] time | 282 |
|
| 4 | [vb past] a time | 51 |
|
