| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | if necessary [verb] | 106 |
|
| 2 | if necessary [to-vb] | 52 |
|
| 3 | if necessary [vb base] | 41 |
|
| 4 | if necessary [v-ing] | 8 |
|
| 5 | if necessary give | 5 |
|
