| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] [noun] must be [prep] | 172 |
|
| 2 | [art] [noun] must be a | 75 |
|
| 3 | [noun] must be [prep] a | 63 |
|
| 4 | [art] [noun] be [prep] a | 8 |
|
