| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] [is] [v-ing] at [det] | 5 |
|
| 2 | [prep] [Wh det] [is] [v-ing] at [det] | 5 |
|
| 3 | [Wh det] [is] [v-ing] at [det] [noun sg] | 7 |
|
| 4 | [Wh det] [is] [v-ing] at [det] [noun] | 7 |
|
