| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [vb infin] be due | 30 |
|
| 2 | may have [be] due | 30 |
|
| 3 | may [vb infin] [been] due | 29 |
|
| 4 | may [vb infin] been due | 29 |
|
