| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] must [prep] [noun sg] [be] | 6 |
|
| 2 | [ex0] must [prep] [noun] [be] | 6 |
|
| 3 | [ex0] must [prep] [be] [adj] | 6 |
|
