| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary [to-vb] at [art] | 10 |
|
| 2 | [be] necessary [to-vb] at [art] | 10 |
|
| 3 | is necessary [to-vb] at [art] | 7 |
|
| 4 | [is] necessary [to-vb] at [art] | 7 |
|
| 5 | necessary [to-vb] [adv] at [art] | 6 |
|
| 6 | necessary [to-vb] [adv] at [art] | 6 |
|
| 7 | necessary [to-vb] at [art] [noun] | 8 |
|
| 8 | necessary [to-vb] at [art] [adj] | 7 |
|
| 9 | necessary [to-vb] at [art] [adj] | 7 |
|
