| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [to-vb] [det] [adj] [noun] | 10 |
|
| 2 | is necessary [verb] [det] [adj] [noun] | 10 |
|
| 3 | is necessary [verb] [det] [adj] [noun] | 9 |
|
| 4 | is necessary [verb] [det] [adj] [noun sg] | 5 |
|
