| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb mod] to be | 61 |
|
| 2 | [Wh pn] [vb mod] to be | 61 |
|
| 3 | [Wh pn] used to be | 42 |
|
| 4 | [Wh pn] ought to be | 18 |
|
