| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary [subord] the | 87 |
|
| 2 | be necessary if the | 41 |
|
| 3 | is necessary [subord] the | 32 |
|
| 4 | be necessary because the | 27 |
|
| 5 | be necessary [subord] the | 20 |
|
| 6 | was necessary [subord] the | 16 |
|
| 7 | are necessary [subord] the | 10 |
|
| 8 | be necessary before the | 7 |
|
