| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [prep] [adj] [noun] | 80 |
|
| 2 | [be] placed [prep] [adj] [noun] | 69 |
|
| 3 | must [be] placed [prep] [noun] | 10 |
|
| 4 | must [be] placed [prep] [adj] | 7 |
|
