| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] [prep] [noun] | 3547 |
|
| 2 | must [verb] [prep] [noun] | 873 |
|
| 3 | must [verb] [been] [prep] | 294 |
|
| 4 | must [verb] [been] [noun] | 120 |
|
