| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] at a [noun] | 520 |
|
| 2 | [verb] [adv] at [art] time | 190 |
|
| 3 | [verb] [adv] at [art] time | 190 |
|
| 4 | [verb] [adv] [prep] a time | 122 |
|
| 5 | [verb] [adv] at a time | 38 |
|
