| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used to [be] [vb pp] | 405 |
|
| 2 | they used to [be] | 206 |
|
| 3 | they to [be] [vb pp] | 24 |
|
| 4 | they used to [vb pp] | 8 |
|
