| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [adj] [verb] | 214 |
|
| 2 | it is [adv] helpful [verb] | 44 |
|
| 3 | it is [adv] helpful [verb] | 40 |
|
| 4 | it [is] often helpful [verb] | 6 |
|
| 5 | it [be] often helpful [verb] | 6 |
|
| 6 | it be often helpful [verb] | 6 |
|
| 7 | [pron] is often helpful [verb] | 5 |
|
| 8 | it is often helpful [verb] | 5 |
|
