| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] necessary [verb] a [adj] | 41 |
|
| 2 | [pers pn] be necessary [verb] a [adj] | 41 |
|
| 3 | [pers pn] [be] necessary [to-vb] a [adj] | 41 |
|
| 4 | [pers pn] [is] necessary [verb] a [adj] | 33 |
|
| 5 | [pers pn] is necessary [verb] a [adj] | 33 |
|
| 6 | [pers pn] [be] necessary have a [adj] | 8 |
|
| 7 | [pers pn] [be] necessary to have a [adj] | 8 |
|
| 8 | [pers pn] [was/were] necessary [verb] a [adj] | 8 |
|
| 9 | [pers pn] was necessary [verb] a [adj] | 8 |
|
