| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] be [vb pp] [prep] | 30285 |
|
| 2 | must be [vb pp] [prep] | 4921 |
|
| 3 | must [adv] be [vb pp] | 1540 |
|
| 4 | must [adv] be [prep] | 118 |
|
