| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] [vb infin] be [prep] | 158 |
|
| 2 | [not/n't] be necessary [prep] | 27 |
|
| 3 | [vb infin] be necessary [prep] | 19 |
|
| 4 | [not/n't] [vb infin] be necessary | 11 |
|
