| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been taken | 80 |
|
| 2 | could have been taken | 17 |
|
| 3 | would have been taken | 14 |
|
| 4 | may have been taken | 13 |
|
| 5 | might have been taken | 12 |
|
| 6 | should have been taken | 11 |
|
| 7 | must have been taken | 7 |
|
