| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at a [noun] | 628 |
|
| 2 | [vb past] at [art] time | 398 |
|
| 3 | [vb past] at [art] time | 398 |
|
| 4 | [verb] at a time | 345 |
|
| 5 | [vb past] [prep] a time | 133 |
|
| 6 | [vb past] at a time | 63 |
|
