| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] [det] [adj] [noun] | 243 |
|
| 2 | is necessary [verb] [adj] [noun] | 126 |
|
| 3 | necessary [verb] [det] [adj] [noun] | 57 |
|
| 4 | is necessary [verb] [det] [noun] | 51 |
|
| 5 | is necessary [verb] [det] [adj] | 13 |
|
