| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | or [verb] at a | 38 |
|
| 2 | or [verb] at a | 38 |
|
| 3 | or [vb pp] at a | 14 |
|
| 4 | or [vb base] at a | 10 |
|
| 5 | or [v-ing] at a | 9 |
|
