| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have [verb] a | 38 |
|
| 2 | it must have [vb pp] a | 38 |
|
| 3 | it [modal v] have taken a | 28 |
|
| 4 | it [vb mod] have taken a | 28 |
|
| 5 | [pers pn] must have taken a | 17 |
|
| 6 | [pron] must have taken a | 17 |
|
| 7 | it must [verb] taken a | 8 |
|
| 8 | it must have taken a | 8 |
|
| 9 | it must have taken [art] | 8 |
|
| 10 | it must have taken a | 8 |
|
| 11 | it must have take a | 8 |
|
