| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be not a necessary | 28 |
|
| 2 | [be] not a necessary | 28 |
|
| 3 | [is] not a necessary | 22 |
|
| 4 | is not a necessary | 20 |
|
| 5 | not a necessary [noun] | 26 |
|
| 6 | not a necessary [noun sg] | 26 |
|
| 7 | not a necessary condition | 9 |
|
| 8 | not a necessary condition | 9 |
|
