| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [be] a [noun] | 3889 |
|
| 2 | must [be] a [noun] | 615 |
|
| 3 | must [adv] [be] a | 92 |
|
| 4 | must [adv] [be] [noun] | 39 |
|
