| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it is necessary for | 30 |
|
| 2 | [conj] it is necessary for | 30 |
|
| 3 | [subord] it is necessary for | 14 |
|
| 4 | that it is necessary for | 10 |
|
| 5 | [that] it is necessary for | 10 |
|
| 6 | that it is necessary for | 10 |
|
| 7 | [coord] it is necessary for | 6 |
|
