| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [modal v] be | 15570 |
|
| 2 | [adj] must be | 1115 |
|
| 3 | [det] must [be] | 900 |
|
| 4 | [det] must be | 900 |
|
| 5 | [det] must [be] | 897 |
|
