| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] it [adj] | 2316 |
|
| 2 | [is] it [adj] | 1654 |
|
| 3 | [be] it necessary | 86 |
|
| 4 | [is] [pron] necessary | 73 |
|
| 5 | [is] it necessary | 70 |
|
