| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been obvious | 27 |
|
| 2 | [vb mod] have [been] obvious | 27 |
|
| 3 | [modal v] have [been] obvious | 25 |
|
| 4 | must have [been] obvious | 10 |
|
| 5 | must have [been] obvious | 10 |
|
| 6 | should have [been] obvious | 9 |
|
| 7 | should have [been] obvious | 9 |
|
| 8 | would have [been] obvious | 5 |
|
| 9 | would have [been] obvious | 5 |
|
