| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [not/n't] [verb] | 2837 |
|
| 2 | may [not/n't] [vb infin] | 2830 |
|
| 3 | [modal v] [not/n't] know | 966 |
|
| 4 | may [adv] know | 127 |
|
| 5 | may [not/n't] know | 78 |
|
