| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] used to | 2564 |
|
| 2 | i [vb mod] to | 510 |
|
| 3 | i [modal v] to | 510 |
|
| 4 | i used to | 386 |
|
| 5 | i used [prep] | 386 |
|
