| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] to [adj] [noun] | 27 |
|
| 2 | must be [vb pp] to [adj] [noun pl] | 13 |
|
| 3 | must be [vb pp] to [adj] [noun sg] | 12 |
|
