| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [adv] be [verb] [prep] | 470 |
|
| 2 | but must be [verb] [prep] | 28 |
|
| 3 | but must [adv] [verb] [prep] | 8 |
|
| 4 | but must [adv] be [verb] | 6 |
|
