| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be changed at [adj] time | 6 |
|
| 2 | [modal v] be changed at [adj] time | 6 |
|
| 3 | can be changed at [adj] time | 5 |
|
| 4 | can be changed at [adj] time | 5 |
|
