| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [to-vb] [art] | 12771 |
|
| 2 | [be] necessary [to-vb] | 2681 |
|
| 3 | necessary [to-vb] [art] | 1673 |
|
| 4 | [be] necessary [art] | 8 |
|
