| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must [verb] [be] [v-ing] [prep] | 57 |
|
| 2 | [pers pn] must [verb] [be] [v-ing] [prep] | 56 |
|
| 3 | it must [verb] [be] [verb] [prep] | 44 |
|
| 4 | it [modal v] [verb] [be] [v-ing] [prep] | 14 |
|
| 5 | it [vb mod] [verb] [be] [v-ing] [prep] | 14 |
|
| 6 | it must [verb] [be] [v-ing] [prep] | 8 |
|
| 7 | it must [verb] [be] [v-ing] [prep] | 8 |
|
| 8 | it must [verb] [be] [v-ing] [prep] | 8 |
|
