| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have been [prep] | 145 |
|
| 2 | may have been [prep] | 145 |
|
| 3 | [vb mod] have been for | 62 |
|
| 4 | [modal v] have been for | 62 |
|
| 5 | may have [be] for | 10 |
|
| 6 | may have [been] for | 10 |
|
| 7 | may have be for | 10 |
|
| 8 | may [vb infin] been for | 10 |
|
| 9 | may have been for | 10 |
|
| 10 | may have been for | 10 |
|
| 11 | may [verb] been for | 10 |
|
| 12 | may have been for | 10 |
|
