| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which is [adj] for [verb] | 48 |
|
| 2 | [pron] is useful for [verb] | 10 |
|
| 3 | which be useful for [verb] | 8 |
|
| 4 | which [be] useful for [verb] | 8 |
|
| 5 | which [is] useful for [verb] | 6 |
|
| 6 | which is useful [prep] [verb] | 6 |
|
| 7 | which is useful [prep] [verb] | 6 |
|
| 8 | which is useful for [verb] | 6 |
|
