| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] they have often [vb pp] | 6 |
|
| 2 | they have often be [vb pp] | 9 |
|
| 3 | they have often been [vb pp] | 9 |
|
| 4 | they have often [be] [vb pp] | 9 |
|
| 5 | they have often [been] [vb pp] | 9 |
|
