| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] used to [be] | 208 |
|
| 2 | [Wh det] used to be | 208 |
|
| 3 | [Wh det] used to [be] | 208 |
|
| 4 | [Wh det] used to be | 208 |
|
| 5 | what used to [be] | 139 |
|
| 6 | which used to [be] | 69 |
|
