| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they must be [noun] | 25 |
|
| 2 | they must [be] [noun] | 22 |
|
| 3 | they must [be] [noun pl] | 14 |
|
| 4 | they must [be] [noun sg] | 10 |
|
