| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary look [adv] at [art] | 5 |
|
| 2 | be necessary [verb] [adv] at [art] | 5 |
|
| 3 | be necessary [verb] [adv] at the | 5 |
|
| 4 | be necessary to look [adv] at [art] | 5 |
|
| 5 | be necessary [to-vb] [adv] at [art] | 5 |
|
