| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] to be a | 520 |
|
| 2 | [modal v] to be a | 520 |
|
| 3 | used to be a | 431 |
|
| 4 | used to be a | 431 |
|
| 5 | ought to be a | 88 |
|
| 6 | ought to be a | 88 |
|
