| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] to be used | 24 |
|
| 2 | [vb mod] to be used | 24 |
|
| 3 | ought to be used | 12 |
|
| 4 | ought to be used | 12 |
|
| 5 | used to be used | 12 |
|
| 6 | used to be used | 12 |
|
