| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] used to [be] | 60 |
|
| 2 | [det] used to [be] | 49 |
|
| 3 | this [modal v] to [be] | 38 |
|
| 4 | this used [prep] [be] | 28 |
|
| 5 | this used to [be] | 28 |
|
