| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is for [adj] | 248 |
|
| 2 | it is necessary for | 104 |
|
| 3 | is necessary for [adj] | 50 |
|
| 4 | it is necessary [adj] | 26 |
|
| 5 | it necessary for [adj] | 7 |
|
