| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] used to [be] | 86 |
|
| 2 | [Wh det] used to [be] [verb] | 73 |
|
| 3 | [prep] [Wh det] to [be] [verb] | 14 |
|
