| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [Wh det] [modal v] [be] | 91 |
|
| 2 | [v-ing] [pron] must [be] | 44 |
|
| 3 | [verb] [Wh det] must [be] | 39 |
|
