| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to be useful to | 7 |
|
| 2 | to be [adv] useful to | 7 |
|
| 3 | to be [adv] useful to | 7 |
|
| 4 | to be useful to [art] | 5 |
|
| 5 | to be useful to [art] | 5 |
|
