| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [v-ing] on this | 18 |
|
| 2 | 's [v-ing] on this | 12 |
|
| 3 | is [v-ing] on this | 6 |
|
| 4 | [is] going on this | 5 |
|
