| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at a [noun] | 958 |
|
| 2 | [v-ing] at a [noun sg] | 911 |
|
| 3 | [verb] at a time | 345 |
|
| 4 | [v-ing] at [art] time | 224 |
|
| 5 | [v-ing] [prep] a time | 75 |
|
| 6 | [v-ing] at a time | 34 |
|
