| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [prep] [art] | 6866 |
|
| 2 | be necessary [prep] [art] | 527 |
|
| 3 | it be necessary [prep] | 270 |
|
| 4 | it necessary [prep] [art] | 17 |
|
