| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] used to | 2564 |
|
| 2 | [Wh det] [modal v] to | 325 |
|
| 3 | [Wh det] [vb mod] to | 325 |
|
| 4 | [Wh det] used [prep] | 210 |
|
| 5 | [Wh det] used to | 210 |
|
