| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [to-vb] [adj] [noun pl] | 63 |
|
| 2 | is necessary [verb] [adj] [noun pl] | 63 |
|
| 3 | is necessary to understand [adj] [noun] | 7 |
|
| 4 | be necessary to understand [adj] [noun pl] | 6 |
|
| 5 | [be] necessary to understand [adj] [noun pl] | 6 |
|
| 6 | is [adj] to understand [adj] [noun pl] | 6 |
|
| 7 | [is] necessary to understand [adj] [noun pl] | 5 |
|
| 8 | is necessary understand [adj] [noun pl] | 5 |
|
