| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] [verb] [adj] [noun pl] | 834 |
|
| 2 | [is] necessary [verb] [adj] [noun] | 131 |
|
| 3 | [be] necessary [verb] [adj] [noun pl] | 121 |
|
