| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must be [verb] | 1448 |
|
| 2 | it must be [adj] | 473 |
|
| 3 | must be [verb] [adj] | 284 |
|
| 4 | it must [verb] [adj] | 58 |
|
| 5 | it be [verb] [adj] | 13 |
|
