| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have be [det] | 26 |
|
| 2 | it must [verb] be [det] | 26 |
|
| 3 | it must [vb infin] be [det] | 26 |
|
| 4 | it must [verb] been [det] | 26 |
|
| 5 | it must [verb] be [det] | 26 |
|
| 6 | it must have be [det] | 25 |
|
| 7 | it must [verb] be some | 12 |
|
