| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [be] a [noun] | 6627 |
|
| 2 | must [verb] a [noun] | 898 |
|
| 3 | must [be] a [noun] | 615 |
|
| 4 | must [verb] [be] a | 435 |
|
| 5 | must [verb] [be] [noun] | 127 |
|
