| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] [verb] [det] [noun pl] | 273 |
|
| 2 | [is] necessary [verb] [adj] [noun pl] | 65 |
|
| 3 | [is] necessary [verb] [det] [noun] | 52 |
|
| 4 | [be] necessary [verb] [det] [noun pl] | 35 |
|
