| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] | 71147 |
|
| 2 | [Wh det] [be] [v-ing] | 7356 |
|
| 3 | [Wh det] [be] [prep] | 5804 |
|
| 4 | [Wh det] [v-ing] [prep] | 72 |
|
