| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [verb] [prep] be able | 5 |
|
| 2 | [vb mod] be [verb] [prep] be able | 5 |
|
| 3 | be [verb] [prep] be able [verb] | 7 |
|
| 4 | be [verb] [prep] be able [to-vb] | 7 |
|
