| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have gone [adv] | 42 |
|
| 2 | [modal v] have gone down | 31 |
|
| 3 | must have [vb pp] down | 20 |
|
| 4 | must have [verb] down | 20 |
|
| 5 | must [verb] gone down | 7 |
|
| 6 | must have go down | 7 |
|
