| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] must be [vb pp] at | 90 |
|
| 2 | must be [vb pp] at [art] | 82 |
|
| 3 | [noun sg] must be [vb pp] [art] | 53 |
|
| 4 | [noun sg] be [vb pp] at [art] | 8 |
|
| 5 | [noun sg] must be at [art] | 8 |
|
