| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [verb] [be] [prep] | 83 |
|
| 2 | it [vb mod] [verb] [be] for | 14 |
|
| 3 | it [modal v] [verb] [be] for | 14 |
|
| 4 | [pron] must [verb] [be] for | 8 |
|
| 5 | it must [verb] [be] for | 6 |
|
