| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have [been] [vb pp] [prep] | 550 |
|
| 2 | [not/n't] have [been] [vb pp] [prep] | 247 |
|
| 3 | may [not/n't] have [vb pp] [prep] | 54 |
|
| 4 | may [not/n't] have [been] [vb pp] | 50 |
|
| 5 | may [not/n't] have [been] [prep] | 15 |
|
