| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] used to | 2564 |
|
| 2 | we [vb mod] to | 399 |
|
| 3 | we [modal v] to | 399 |
|
| 4 | we used to | 212 |
|
| 5 | we used [prep] | 212 |
|
