| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [pron] used to [be] | 416 |
|
| 2 | but [pron] [modal v] to [be] | 44 |
|
| 3 | but [pron] [vb mod] to [be] | 44 |
|
| 4 | but [pron] used to [be] | 25 |
|
| 5 | but [pron] used [prep] [be] | 25 |
|
