| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [pron] [is] [v-ing] | 825 |
|
| 2 | what it [is] [verb] | 283 |
|
| 3 | [pron] it [is] [v-ing] | 256 |
|
| 4 | what it [be] [v-ing] | 177 |
|
