| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [is] [adj] for [v-ing] | 340 |
|
| 2 | [noun] [be] useful for [v-ing] | 44 |
|
| 3 | [noun] [is] useful [prep] [v-ing] | 41 |
|
| 4 | [noun] [is] useful for [verb] | 24 |
|
