| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] useful for | 98 |
|
| 2 | [adv] useful for [verb] | 90 |
|
| 3 | is [adv] useful [verb] | 81 |
|
| 4 | is useful for [verb] | 39 |
|
| 5 | is [adv] for [verb] | 12 |
|
