| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it is [adj] | 3698 |
|
| 2 | [conj] it is necessary | 263 |
|
| 3 | [subord] it be necessary | 191 |
|
| 4 | [subord] it [be] necessary | 191 |
|
| 5 | [subord] it [is] necessary | 148 |
|
| 6 | [subord] [pron] is necessary | 131 |
|
| 7 | [subord] it is necessary | 130 |
|
| 8 | [subord] [pers pn] is necessary | 130 |
|
