| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] must have [been] some | 24 |
|
| 2 | there must [verb] [been] some | 24 |
|
| 3 | [ex0] must [verb] been some | 24 |
|
| 4 | [ex0] must have [been] some | 24 |
|
| 5 | [ex0] must [vb infin] [been] some | 24 |
|
