| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] to be an | 47 |
|
| 2 | [modal v] to be an | 47 |
|
| 3 | [vb mod] to be an | 47 |
|
| 4 | used to be an | 40 |
|
| 5 | used to be an | 40 |
|
| 6 | ought to be an | 7 |
|
| 7 | ought to be an | 7 |
|
