| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] be useful for [adj] [noun sg] | 5 |
|
| 2 | [vb mod] be useful for [adj] [noun sg] | 5 |
|
| 3 | [modal v] be useful for [adj] [noun sg] | 5 |
|
| 4 | be [adv] useful for [adj] [noun sg] | 9 |
|
| 5 | be [adv] useful for [adj] [noun sg] | 9 |
|
