| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] by [noun sg] | 2823 |
|
| 2 | must be [vb pp] by | 795 |
|
| 3 | must be [vb pp] [noun sg] | 39 |
|
| 4 | must be by [noun sg] | 5 |
|
