| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] used to [be] | 1772 |
|
| 2 | there [modal v] to [be] | 431 |
|
| 3 | there used to [be] | 341 |
|
| 4 | there used [prep] [be] | 341 |
|
| 5 | [ex0] used to [be] | 341 |
|
