| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] is useful [verb] | 188 |
|
| 2 | is useful for [verb] | 39 |
|
| 3 | [pron] is useful for | 32 |
|
| 4 | [pron] is for [verb] | 15 |
|
