| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | useful for [verb] [noun] | 69 |
|
| 2 | is useful for [verb] | 39 |
|
| 3 | is useful for [noun] | 17 |
|
| 4 | is useful [verb] [noun] | 17 |
|
| 5 | is for [verb] [noun] | 15 |
|
