| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have [been] [verb] | 1112 |
|
| 2 | [modal v] have [been] drive | 18 |
|
| 3 | [vb mod] have [been] drive | 18 |
|
| 4 | may have [be] drive | 6 |
|
| 5 | may have [been] drive | 6 |
|
| 6 | may [verb] [been] drive | 6 |
|
