| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] useful for [verb] | 28 |
|
| 2 | is [adv] useful for [v-ing] | 28 |
|
| 3 | is particularly useful for [verb] | 10 |
|
| 4 | is also useful for [verb] | 10 |
|
