| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this may have [been] [verb] | 20 |
|
| 2 | this may [vb infin] [been] [verb] | 20 |
|
| 3 | this may [vb infin] [been] [vb pp] | 20 |
|
| 4 | this may [vb infin] been [verb] | 20 |
|
| 5 | this may [vb infin] [been] [verb] | 20 |
|
