| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] [vb infin] [be] | 782 |
|
| 2 | [vb mod] once [vb infin] [be] | 67 |
|
| 3 | [modal v] once [vb infin] [be] | 67 |
|
| 4 | may once [verb] [be] | 14 |
|
| 5 | may once [vb infin] [be] | 14 |
|
