| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | useful for [verb] the | 41 |
|
| 2 | [is] useful for [verb] | 40 |
|
| 3 | [is] useful [verb] the | 32 |
|
| 4 | [is] for [verb] the | 14 |
|
| 5 | [is] useful for the | 13 |
|
