| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] be [adj] | 772 |
|
| 2 | must [vb infin] be [det] | 100 |
|
| 3 | [modal v] [vb infin] be several | 9 |
|
| 4 | must [vb infin] [be] several | 6 |
|
| 5 | must [vb infin] be several | 6 |
|
| 6 | must [verb] be several | 6 |
|
