| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | 've [verb] to | 1485 |
|
| 2 | 've [vb pp] to | 1478 |
|
| 3 | [verb] referred to | 219 |
|
| 4 | have referred to | 188 |
|
| 5 | [vb base] referred to | 80 |
|
| 6 | 've referred [prep] | 16 |
|
| 7 | 've refer to | 16 |
|
