| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] be [adj] [prep] | 170 |
|
| 2 | it must be [adj] [prep] | 122 |
|
| 3 | it must [vb infin] be [adj] | 102 |
|
| 4 | it must [vb infin] be [prep] | 83 |
|
| 5 | it must [vb infin] [adj] [prep] | 7 |
|
