| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] be [adv] a | 681 |
|
| 2 | must [verb] be [adv] | 543 |
|
| 3 | must [verb] be a | 488 |
|
| 4 | must be [adv] a | 44 |
|
| 5 | must [verb] [adv] a | 30 |
|
