| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [been] [verb] | 7006 |
|
| 2 | might have [been] [verb] | 907 |
|
| 3 | might [vb infin] [been] [verb] | 907 |
|
| 4 | might [verb] [been] [verb] | 907 |
|
| 5 | might have [be] [verb] | 901 |
|
