| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] [prep] us [verb] | 76 |
|
| 2 | it is [adj] [prep] us [verb] | 73 |
|
| 3 | it is necessary [prep] [pron] [verb] | 25 |
|
| 4 | it is necessary [prep] [pers pn] [verb] | 21 |
|
| 5 | it be necessary [prep] us [verb] | 11 |
|
| 6 | it [be] necessary [prep] us [verb] | 11 |
|
| 7 | it [is] necessary [prep] us [verb] | 10 |
|
| 8 | it is necessary [prep] us [verb] | 9 |
|
| 9 | [pron] is necessary [prep] us [verb] | 9 |
|
| 10 | it is necessary [prep] us [verb] | 9 |
|
| 11 | it is necessary [prep] we [verb] | 9 |
|
