| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [verb] at a [noun] | 291 |
|
| 2 | [adv] [verb] at [art] time | 158 |
|
| 3 | [adv] [verb] [prep] a time | 36 |
|
| 4 | [adv] [verb] at a time | 16 |
|
