| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [v-ing] in | 1605 |
|
| 2 | [is] it [v-ing] | 499 |
|
| 3 | [is] it in | 111 |
|
| 4 | it [v-ing] in | 82 |
|
