| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [modal v] [be] [verb] to | 326 |
|
| 2 | [adj] [modal v] [be] refer to | 16 |
|
| 3 | [det] [modal v] [be] refer [prep] | 11 |
|
| 4 | [det] [modal v] [be] refer [prep] | 11 |
|
| 5 | [det] [modal v] [be] refer to | 11 |
|
