| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] they have [adv] [vb pp] before | 8 |
|
| 2 | [pron] they had [adv] [vb pp] before | 5 |
|
| 3 | [pron] they have never [vb pp] before | 5 |
|
