| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] by the [noun sg] | 157 |
|
| 2 | must be signed by the [noun sg] | 11 |
|
| 3 | must be approved by the [noun sg] | 9 |
|
| 4 | must be [vb pp] by the end | 9 |
|
| 5 | must be [vb pp] by the secretary | 5 |
|
