| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] have taken | 106 |
|
| 2 | it would have taken | 68 |
|
| 3 | it must have taken | 22 |
|
| 4 | it may have taken | 6 |
|
| 5 | it should have taken | 6 |
|
