| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] a [adj] | 502 |
|
| 2 | [det] must [be] a | 90 |
|
| 3 | [det] must [be] [adj] | 73 |
|
| 4 | [det] [be] a [adj] | 35 |
|
