| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [verb] [adj] | 207 |
|
| 2 | is [adj] [verb] two | 54 |
|
| 3 | is necessary [verb] [num] | 18 |
|
| 4 | be necessary [verb] two | 16 |
|
| 5 | [be] necessary [verb] two | 16 |
|
| 6 | is necessary [verb] two | 10 |
|
| 7 | [is] necessary [verb] two | 10 |
|
