| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [vb pp] a mistake | 20 |
|
| 2 | [vb mod] have [vb pp] a mistake | 20 |
|
| 3 | must have [vb pp] a mistake | 9 |
|
| 4 | must have [vb pp] a mistake | 9 |
|
