| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have gone [adv] | 39 |
|
| 2 | [modal v] have gone down | 30 |
|
| 3 | must have [verb] down | 18 |
|
| 4 | must have [vb pp] down | 18 |
|
| 5 | must have gone down | 7 |
|
| 6 | must have go down | 7 |
|
| 7 | must [verb] gone down | 7 |
|
| 8 | must [vb infin] gone down | 7 |
|
