| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] to be when | 6 |
|
| 2 | [vb mod] to be when | 6 |
|
| 3 | used to be when | 6 |
|
| 4 | used to be when | 6 |
|
| 5 | [modal v] to be when | 6 |
|
