| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] [adj] | 11817 |
|
| 2 | must be [vb pp] [prep] | 4919 |
|
| 3 | must be [vb pp] [adj] | 218 |
|
| 4 | must be [prep] [adj] | 89 |
|
