| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at a time | 345 |
|
| 2 | [verb] [vb pp] at a | 245 |
|
| 3 | [vb pp] at a time | 148 |
|
| 4 | [verb] [vb pp] a time | 14 |
|
