| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [noun] | 681 |
|
| 2 | [modal v] be people | 55 |
|
| 3 | must be [n mass] | 17 |
|
| 4 | must be people | 5 |
|
| 5 | must [be] people | 5 |
|
