| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [prep] [pos pn] [adj] | 979 |
|
| 2 | must be [prep] [adj] | 89 |
|
| 3 | must be [prep] [pos pn] | 76 |
|
| 4 | must be [pos pn] [adj] | 17 |
|
