| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [pron] [be] [v-ing] [prep] | 2267 |
|
| 2 | [Wh det] it [be] [verb] [prep] | 237 |
|
| 3 | [pron] it [be] [v-ing] [prep] | 83 |
|
| 4 | [Wh det] it [be] [v-ing] [prep] | 76 |
|
