| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] been [art] | 3025 |
|
| 2 | [modal v] [verb] been [art] | 3025 |
|
| 3 | must [verb] [be] [art] | 651 |
|
| 4 | must [verb] be [art] | 651 |
|
| 5 | must [verb] been [art] | 632 |
|
| 6 | must [verb] [been] [art] | 632 |
|
