| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] have taken a | 25 |
|
| 2 | it [vb mod] have taken a | 25 |
|
| 3 | it would have taken a | 17 |
|
| 4 | it would have taken a | 17 |
|
| 5 | it must have taken a | 8 |
|
| 6 | it must have taken a | 8 |
|
