| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [pron] used to | 68 |
|
| 2 | what [pers pn] used to | 67 |
|
| 3 | what it [modal v] to | 36 |
|
| 4 | [pron] it used to | 35 |
|
| 5 | what it used to | 31 |
|
| 6 | what it used [prep] | 31 |
|
