| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb -s] be [v-ing] at | 6 |
|
| 2 | [Wh det] [vb -s] been [v-ing] at | 6 |
|
| 3 | [Wh det] has be [v-ing] at | 5 |
|
