| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] for [verb] | 659 |
|
| 2 | [be] useful for [verb] | 99 |
|
| 3 | [is] useful [prep] [verb] | 72 |
|
| 4 | [is] useful [prep] [verb] | 72 |
|
| 5 | [is] useful for [verb] | 40 |
|
