| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] a [noun sg] | 7456 |
|
| 2 | [v-ing] at a [noun sg] | 848 |
|
| 3 | be at a [noun sg] | 618 |
|
| 4 | be [v-ing] at a | 476 |
|
| 5 | be [v-ing] at [noun sg] | 359 |
|
