| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [prep] [noun] | 239 |
|
| 2 | it must [be] [prep] | 189 |
|
| 3 | it must [be] [noun] | 147 |
|
| 4 | it [be] [prep] [noun] | 18 |
|
| 5 | it must [prep] [noun] | 14 |
|
