| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [v-ing] at | 874 |
|
| 2 | [v-ing] at this | 283 |
|
| 3 | [is] [v-ing] this | 215 |
|
| 4 | [is] at this | 134 |
|
