| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] what it must [vb infin] [be] | 8 |
|
| 2 | [verb] what it must [vb infin] be | 8 |
|
| 3 | [verb] what it must [vb infin] been | 8 |
|
| 4 | [verb] what it must [vb infin] [been] | 8 |
|
