| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] used to | 2564 |
|
| 2 | [pers pn] used to | 1947 |
|
| 3 | they [modal v] to | 504 |
|
| 4 | they used to | 381 |
|
| 5 | they used [prep] | 379 |
|
