| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [modal v] [vb infin] [been] [verb] | 349 |
|
| 2 | [pron] may [vb infin] [been] [verb] | 328 |
|
| 3 | which may [vb infin] [be] [verb] | 67 |
|
| 4 | which may [verb] [been] [verb] | 67 |
|
