| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have see a | 33 |
|
| 2 | [vb mod] have seen a | 30 |
|
| 3 | may have see a | 8 |
|
| 4 | would have see a | 7 |
|
| 5 | must have see a | 6 |
|
