| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] a [adj] | 26 |
|
| 2 | must be [v-ing] a [adj] | 9 |
|
| 3 | must be given a [adj] | 5 |
|
| 4 | must be give a [adj] | 5 |
|
