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