| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [vb mod] [be] useful [prep] [adj] | 8 |
|
| 2 | [noun sg] [vb mod] be useful [prep] [adj] | 8 |
|
| 3 | [noun sg] [vb mod] [be] useful for [adj] | 5 |
|
