| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] a [noun] | 43505 |
|
| 2 | at a [noun] | 15341 |
|
| 3 | [v-ing] at [noun] | 4590 |
|
| 4 | [v-ing] at a | 1472 |
|
