| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be a [adj] | 457 |
|
| 2 | [modal v] be a [adj -er] | 313 |
|
| 3 | must be [art] [adj -er] | 32 |
|
| 4 | must be [art] [adj -er] | 32 |
|
| 5 | must be a [adj -er] | 26 |
|
| 6 | must [be] a [adj -er] | 25 |
|
