| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used to [be] [art] | 648 |
|
| 2 | used to [be] [art] | 648 |
|
| 3 | [modal v] to [be] a | 520 |
|
| 4 | [vb mod] to [be] a | 520 |
|
| 5 | used to [be] a | 471 |
|
| 6 | used [prep] [be] a | 432 |
|
| 7 | used to [be] a | 431 |
|
