| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have [been] a [adj] | 80 |
|
| 2 | may not have [been] [adj] | 68 |
|
| 3 | not have [been] a [adj] | 36 |
|
| 4 | may not have [been] a | 16 |
|
| 5 | may not have a [adj] | 8 |
|
