| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i [modal v] to be able | 27 |
|
| 2 | i [vb mod] to [be] able | 27 |
|
| 3 | i used to [be] able | 16 |
|
| 4 | i used to [be] able | 16 |
|
| 5 | i ought to [be] able | 11 |
|
| 6 | i ought to [be] able | 11 |
|
