| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at [det] | 1424 |
|
| 2 | [been] [v-ing] [det] | 912 |
|
| 3 | [been] [v-ing] at | 511 |
|
| 4 | [been] at [det] | 79 |
|
