| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at a [noun sg] | 848 |
|
| 2 | [be] [v-ing] a [noun sg] | 811 |
|
| 3 | [be] at a [noun sg] | 87 |
|
| 4 | [be] [v-ing] at a | 53 |
|
| 5 | [be] [v-ing] at [noun sg] | 43 |
|
