| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] for [verb] | 618 |
|
| 2 | be useful for [verb] | 99 |
|
| 3 | [be] useful for [verb] | 99 |
|
| 4 | is useful [prep] [verb] | 70 |
|
| 5 | is useful [prep] [verb] | 70 |
|
| 6 | [is] useful for [verb] | 40 |
|
| 7 | is useful for [verb] | 39 |
|
