| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb mod] [verb] to be able | 7 |
|
| 2 | they [vb mod] [vb infin] to be able | 7 |
|
| 3 | they [vb mod] to be able [verb] | 6 |
|
| 4 | they [vb mod] to be able [to-vb] | 6 |
|
