| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] necessary | 1964 |
|
| 2 | it be necessary | 1964 |
|
| 3 | it [is] necessary | 1502 |
|
| 4 | it is necessary | 1407 |
|
| 5 | it [was/were] necessary | 431 |
|
| 6 | it was necessary | 425 |
|
| 7 | it [verb] necessary | 105 |
|
| 8 | it 's necessary | 95 |
|
| 9 | it become necessary | 63 |
|
| 10 | it [vb -s] necessary | 52 |
|
| 11 | it [vb past] necessary | 43 |
|
| 12 | it became necessary | 33 |
|
| 13 | it [subord] necessary | 32 |
|
| 14 | it [conj] necessary | 32 |
|
| 15 | it [adv] necessary | 28 |
|
| 16 | it [adv] necessary | 25 |
|
| 17 | it becomes necessary | 24 |
|
| 18 | it be necessary | 23 |
|
| 19 | it [be] necessary | 23 |
|
| 20 | it seem necessary | 14 |
|
| 21 | it if necessary | 13 |
|
| 22 | it if necessary | 13 |
|
| 23 | it as necessary | 13 |
|
| 24 | it as necessary | 13 |
|
| 25 | it seems necessary | 10 |
|
| 26 | it really necessary | 9 |
|
| 27 | it really necessary | 9 |
|
| 28 | it [art] necessary | 8 |
|
| 29 | it prove necessary | 8 |
|
| 30 | it [art] necessary | 8 |
|
