| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [been] [verb] [prep] | 320 |
|
| 2 | [vb infin] [been] [verb] [prep] some | 45 |
|
| 3 | must [vb infin] [verb] [prep] some | 22 |
|
| 4 | must [vb infin] [been] [prep] some | 6 |
|
