| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [to-vb] [num] [noun] | 16 |
|
| 2 | it be useful [to-vb] [noun] | 15 |
|
| 3 | it be useful [to-vb] [num] | 8 |
|
| 4 | be useful [to-vb] [num] [noun] | 7 |
|
