| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [adj] | 750 |
|
| 2 | [modal v] have been some | 103 |
|
| 3 | must have been [det] | 92 |
|
| 4 | must [vb infin] been some | 43 |
|
| 5 | must have been some | 43 |
|
| 6 | must [verb] been some | 43 |
|
| 7 | must have [be] some | 42 |
|
| 8 | must have be some | 42 |
|
| 9 | must have been some | 42 |
|
| 10 | must have [been] some | 42 |
|
