| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] in a [adj] | 1016 |
|
| 2 | must be [vb pp] in [adj] | 163 |
|
| 3 | must be [vb pp] in a | 79 |
|
| 4 | must be [vb pp] a [adj] | 28 |
|
| 5 | must be in a [adj] | 7 |
|
