| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [adj] [adv] [to-vb] | 260 |
|
| 2 | is [adv] [adj] [adv] [to-vb] | 253 |
|
| 3 | be [adv] necessary [adv] [to-vb] | 11 |
|
| 4 | [be] [adv] necessary [adv] [to-vb] | 11 |
|
| 5 | is [adv] necessary [adv] [to-vb] | 10 |
|
| 6 | is [adv] necessary [adv] [verb] | 10 |
|
| 7 | [is] [adv] necessary [adv] [to-vb] | 9 |
|
| 8 | is [adv] necessary [adv] [to-vb] | 9 |
|
