| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | very useful [conj] it [verb] | 7 |
|
| 2 | very useful [conj] it [verb] | 7 |
|
| 3 | very useful [subord] it [verb] | 6 |
|
| 4 | very useful [conj] it [vb -s] | 5 |
|
