| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [modal v] be on | 991 |
|
| 2 | [noun] must be [prep] | 502 |
|
| 3 | [noun] must be [prep] | 502 |
|
| 4 | [noun] must be on | 71 |
|
| 5 | [noun] must [be] on | 71 |
|
| 6 | [noun] must [be] on | 71 |
|
| 7 | [noun] must be on | 71 |
|
