| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [verb] [adj] [noun pl] | 63 |
|
| 2 | is necessary understand [adj] [noun] | 7 |
|
| 3 | is [adj] understand [adj] [noun pl] | 6 |
|
| 4 | [be] necessary understand [adj] [noun pl] | 6 |
|
| 5 | be necessary understand [adj] [noun pl] | 6 |
|
| 6 | [is] necessary understand [adj] [noun pl] | 5 |
|
