| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [not/n't] [verb] a [noun] | 363 |
|
| 2 | be required [verb] a [noun] | 156 |
|
| 3 | be [not/n't] required [verb] [noun] | 18 |
|
| 4 | be [not/n't] required [verb] a | 12 |
|
| 5 | [not/n't] required [verb] a [noun] | 7 |
|
