| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] at [art] | 2298 |
|
| 2 | be at [art] back | 97 |
|
| 3 | [v-ing] at [art] back | 84 |
|
| 4 | be [v-ing] [art] back | 11 |
|
