| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may be [vb pp] [prep] a | 1133 |
|
| 2 | not be [vb pp] [prep] a | 847 |
|
| 3 | may not be [vb pp] [prep] | 246 |
|
| 4 | may not be [prep] a | 16 |
|
