| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] [vb mod] to [be] | 108 |
|
| 2 | [prep] [Wh det] [modal v] to [be] | 108 |
|
| 3 | [prep] [pron] used to [be] | 104 |
|
| 4 | [prep] [Wh det] used to [be] | 86 |
|
| 5 | [prep] [Wh det] used [prep] [be] | 86 |
|
