| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] must be [vb pp] | 4161 |
|
| 2 | must be [vb pp] at | 229 |
|
| 3 | [noun sg] must be at | 35 |
|
| 4 | [noun sg] be [vb pp] at | 26 |
|
