| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they may have [been] [vb pp] [verb] | 6 |
|
| 2 | they may have be [vb pp] [verb] | 6 |
|
| 3 | they may have [be] [vb pp] [verb] | 6 |
|
| 4 | they may have been [vb pp] [verb] | 6 |
|
