| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [is] [pron] [v-ing] [prep] | 45 |
|
| 2 | [Wh adv] [is] it [verb] [prep] | 38 |
|
| 3 | [Wh adv] [is] it [v-ing] [prep] | 25 |
|
| 4 | [Wh adv] [be] it [v-ing] [prep] | 23 |
|
| 5 | [adv] [is] it [v-ing] [prep] | 23 |
|
