| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] a [noun sg] | 47527 |
|
| 2 | at a [noun sg] | 15818 |
|
| 3 | [v-ing] at a | 1677 |
|
| 4 | [v-ing] at [noun sg] | 1515 |
|
