| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] of [noun sg] [modal v] [be] useful | 9 |
|
| 2 | [noun sg] of [noun sg] [modal v] [be] useful | 7 |
|
| 3 | of [noun sg] [pron] [modal v] [be] useful | 6 |
|
| 4 | of [noun sg] which [modal v] [be] useful | 5 |
|
| 5 | of [noun sg] [Wh det] [modal v] [be] useful | 5 |
|
| 6 | of [noun sg] which [modal v] [be] useful | 5 |
|
