| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have [been] some | 12 |
|
| 2 | it must have been some | 12 |
|
| 3 | it must have [be] some | 12 |
|
| 4 | it must have be some | 12 |
|
| 5 | it must have some [adj] | 5 |
|
| 6 | it must have some [noun] | 5 |
|
