| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] used to be | 208 |
|
| 2 | what [vb mod] to be | 186 |
|
| 3 | which [vb mod] to be | 130 |
|
| 4 | [Wh det] ought to be | 107 |
|
