| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] for [v-ing] [noun] | 122 |
|
| 2 | [be] useful for [v-ing] [noun] | 26 |
|
| 3 | [is] useful [prep] [v-ing] [noun] | 16 |
|
| 4 | [is] useful for [verb] [noun] | 11 |
|
