| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] as a useful | 17 |
|
| 2 | [vb mod] [verb] as a useful | 17 |
|
| 3 | [modal v] serve as a useful | 14 |
|
| 4 | [modal v] serve as a useful | 14 |
|
| 5 | can [verb] as a useful | 7 |
|
| 6 | can [verb] as a useful | 7 |
|
