| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] it is necessary | 79 |
|
| 2 | [Wh adv] it is necessary | 28 |
|
| 3 | why it is necessary | 16 |
|
| 4 | why it is necessary | 16 |
|
| 5 | sometimes it is necessary | 10 |
|
| 6 | then it is necessary | 10 |
|
| 7 | then it is necessary | 10 |
|
| 8 | sometimes it is necessary | 10 |
|
| 9 | so it is necessary | 9 |
|
| 10 | so it is necessary | 9 |
|
| 11 | often it is necessary | 6 |
|
| 12 | here it is necessary | 6 |
|
| 13 | here it is necessary | 6 |
|
| 14 | often it is necessary | 6 |
|
| 15 | where it is necessary | 5 |
|
| 16 | where it is necessary | 5 |
|
