| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] [prep] [det] [noun] | 264 |
|
| 2 | must be [vb pp] [prep] [det] [noun] | 258 |
|
| 3 | [modal v] be used [prep] [det] [noun] | 174 |
|
| 4 | must be used [prep] [adj] [noun] | 13 |
|
| 5 | must [be] used [prep] [det] [noun] | 5 |
|
| 6 | must be used [prep] [det] [noun] | 5 |
|
| 7 | must be use [prep] [det] [noun] | 5 |
|
| 8 | must be used [prep] [det] [noun] | 5 |
|
| 9 | must [be] used [prep] [det] [noun] | 5 |
|
