| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adj] [prep] us | 113 |
|
| 2 | it is [adj] [prep] us | 108 |
|
| 3 | it is necessary [prep] [pron] | 36 |
|
| 4 | it is necessary [prep] [pers pn] | 23 |
|
| 5 | it [be] necessary [prep] us | 13 |
|
| 6 | it be necessary [prep] us | 13 |
|
| 7 | it [is] necessary [prep] us | 11 |
|
| 8 | it is necessary [prep] us | 10 |
|
| 9 | [pron] is necessary [prep] us | 10 |
|
| 10 | it is necessary [prep] us | 10 |
|
| 11 | it is necessary [prep] we | 10 |
|
