| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be common [noun sg] [verb] | 27 |
|
| 2 | it be common [noun] [to-vb] | 27 |
|
| 3 | it be common practice [verb] | 23 |
|
| 4 | it be common practice [verb] | 23 |
|
| 5 | it is common [noun] [verb] | 21 |
|
