| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] useful for [adj] [noun] | 40 |
|
| 2 | useful for [v-ing] [adj] [noun] | 27 |
|
| 3 | [be] useful for [v-ing] [noun] | 26 |
|
| 4 | [be] useful for [v-ing] [adj] | 12 |
|
| 5 | [be] for [v-ing] [adj] [noun] | 10 |
|
