| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] to go down | 50 |
|
| 2 | used to go down | 43 |
|
| 3 | used to go down | 43 |
|
| 4 | ought to go down | 7 |
|
| 5 | ought to go down | 7 |
|
