| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is necessary [verb] [prep] | 144 |
|
| 2 | it is [adj] [verb] for | 115 |
|
| 3 | it is [adj] [verb] for | 103 |
|
| 4 | it [be] necessary [verb] for | 13 |
|
| 5 | it be necessary [verb] for | 13 |
|
| 6 | it [is] necessary [verb] for | 12 |
|
| 7 | [pers pn] is necessary [verb] for | 12 |
|
| 8 | it is necessary [verb] for | 12 |
|
| 9 | [pron] is necessary [verb] for | 12 |
|
| 10 | it is necessary [verb] for | 12 |
|
