| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] useful for [adj] [noun pl] | 26 |
|
| 2 | [be] useful for [adj] [noun pl] | 12 |
|
| 3 | [be] [adv] useful for [adj] | 8 |
|
| 4 | [be] [adv] for [adj] [noun pl] | 8 |
|
| 5 | [be] [adv] useful for [noun pl] | 5 |
|
