| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [verb] be useful | 9 |
|
| 2 | [noun sg] [verb] [been] useful | 7 |
|
| 3 | [noun sg] have [be] useful | 7 |
|
| 4 | [noun sg] [verb] been useful | 7 |
|
| 5 | [noun sg] has [be] useful | 6 |
|
| 6 | [noun sg] [vb -s] [be] useful | 6 |
|
