| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] have be | 769 |
|
| 2 | may [adv] have be | 521 |
|
| 3 | [modal v] once have be | 67 |
|
| 4 | [vb mod] once have be | 67 |
|
| 5 | may once have be | 14 |
|
| 6 | may once [vb infin] be | 14 |
|
| 7 | may once [verb] be | 14 |
|
| 8 | may once have [be] | 14 |
|
| 9 | may once have be | 14 |
|
| 10 | may once have be | 14 |
|
