| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] to be able | 146 |
|
| 2 | ought to be able | 98 |
|
| 3 | ought to be able | 98 |
|
| 4 | used to be able | 48 |
|
| 5 | used to be able | 48 |
|
