| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have [been] [prep] [art] | 59 |
|
| 2 | [not/n't] have [been] [prep] [art] | 43 |
|
| 3 | may [not/n't] have [been] [art] | 39 |
|
| 4 | may [not/n't] have [been] [prep] | 15 |
|
