| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have [verb] | 287 |
|
| 2 | it must have [vb pp] | 285 |
|
| 3 | it [modal v] have taken | 109 |
|
| 4 | [pron] must have taken | 70 |
|
| 5 | [pers pn] must have taken | 62 |
|
| 6 | it must have take | 23 |
|
| 7 | it must [verb] taken | 22 |
|
| 8 | it must have taken | 22 |
|
