| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] [noun] [noun sg] must be [prep] | 18 |
|
| 2 | [art] [noun sg] [noun sg] must be [prep] | 18 |
|
| 3 | the [noun] [noun sg] must be [prep] | 13 |
|
| 4 | [art] [noun] [noun sg] must be in | 6 |
|
